Prosecution Insights
Last updated: October 21, 2026
Application No. 18/294,737

METHOD AND TOOL FOR ASSEMBLING AN ELECTRIC MACHINE ROTOR

Non-Final OA §102§112
Filed
Feb 02, 2024
Priority
Aug 04, 2021 — FR 2108464 +1 more
Examiner
ABRAHAM, JOSE K
Art Unit
3729
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Whylot
OA Round
1 (Non-Final)
84%
Grant Probability
Favorable
1-2
OA Rounds
1m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 84% — above average
84%
Career Allowance Rate
319 granted / 382 resolved
+13.5% vs TC avg
Strong +32% interview lift
Without
With
+32.5%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
40 currently pending
Career history
426
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
47.9%
+7.9% vs TC avg
§102
16.8%
-23.2% vs TC avg
§112
31.6%
-8.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 382 resolved cases

Office Action

§102 §112
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Information Disclosure Statement The information disclosure statement (IDS) submitted on 02 February 2024 was filed prior to the mailing date of this office correspondence. The submission is in compliance with the provisions of 37 CFR 1.97. Accordingly, the information disclosure statement is being considered by the examiner. Specification The abstract of the disclosure is objected to and line 1 “This relates to a tool and a method for assembling an electric machine rotor, including a rotor body and magnetic pole elements. The process includes:”, may amend similar to: “A method and a tool for assembling an electric machine rotor, including a rotor body and magnetic pole element. The method includes:”. A corrected abstract of the disclosure is required and must be presented on a separate sheet, apart from any other text. See MPEP § 608.01(b). Claim Objections Claims 1, 3 and 7 are objected to because of the following informalities: In claim 1, lines 4, 7, and 9: - positioning the rotor body… - placing an upper seal… - injecting a joining material… should read: -- positioning the rotor body… placing an upper seal… injecting a joining material… -- In claim 1, line 9: “injecting a joining material into the spaces, through holes” should read: -- injecting a joining material into the spaces through holes -- In claim 3, line 3: “there is a step of blocking in position the rotor body and the magnetic pole elements” should read: -- there is a step of locking in position the rotor body and the magnetic pole elements -- In claim 7, lines 4, 5, 8 and 11: - a bearing element - a support… - a press element … - means for injecting … should read: -- a bearing element a support… a press element … means for injecting … -- In claim 7, line 9: “so that it closes the spaces” should read: -- so that the upper seal closes the spaces -- In claim 7, line 11: “injecting a joining material into the spaces, through holes” should read: -- injecting a joining material into the spaces through holes -- Appropriate correction is required. Claim Interpretation The following is a quotation of 35 U.S.C. 112(f): (f) Element in Claim for a Combination. – An element in a claim for a combination may be expressed as a means or step for performing a specified function without the recital of structure, material, or acts in support thereof, and such claim shall be construed to cover the corresponding structure, material, or acts described in the specification and equivalents thereof. The following is a quotation of pre-AIA 35 U.S.C. 112, sixth paragraph: An element in a claim for a combination may be expressed as a means or step for performing a specified function without the recital of structure, material, or acts in support thereof, and such claim shall be construed to cover the corresponding structure, material, or acts described in the specification and equivalents thereof. The claims in this application are given their broadest reasonable interpretation using the plain meaning of the claim language in light of the specification as it would be understood by one of ordinary skill in the art. The broadest reasonable interpretation of a claim element (also commonly referred to as a claim limitation) is limited by the description in the specification when 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is invoked. As explained in MPEP § 2181, subsection I, claim limitations that meet the following three-prong test will be interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph: (A) the claim limitation uses the term “means” or “step” or a term used as a substitute for “means” that is a generic placeholder (also called a nonce term or a non-structural term having no specific structural meaning) for performing the claimed function; (B) the term “means” or “step” or the generic placeholder is modified by functional language, typically, but not always linked by the transition word “for” (e.g., “means for”) or another linking word or phrase, such as “configured to” or “so that”; and (C) the term “means” or “step” or the generic placeholder is not modified by sufficient structure, material, or acts for performing the claimed function. Use of the word “means” (or “step”) in a claim with functional language creates a rebuttable presumption that the claim limitation is to be treated in accordance with 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. The presumption that the claim limitation is interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is rebutted when the claim limitation recites sufficient structure, material, or acts to entirely perform the recited function. Absence of the word “means” (or “step”) in a claim creates a rebuttable presumption that the claim limitation is not to be treated in accordance with 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. The presumption that the claim limitation is not interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, is rebutted when the claim limitation recites function without reciting sufficient structure, material or acts to entirely perform the recited function. Claim limitations in this application that use the word “means” (or “step”) are being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, except as otherwise indicated in an Office action. Conversely, claim limitations in this application that do not use the word “means” (or “step”) are not being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, except as otherwise indicated in an Office action. This application includes one or more claim limitations that do not use the word “means,” but are nonetheless being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, because the claim limitation(s) uses a generic placeholder that is coupled with functional language without reciting sufficient structure to perform the recited function and the generic placeholder is not preceded by a structural modifier. Such claim limitation(s) is/are: means for injecting a joining material in claim 7. The claim limitation(s) has/have been presumed to invoke 35 U.S.C. 112, sixth paragraph, because it/they meet(s) the following 3-prong analysis: (A) The claim limitation(s) use the phrase “means for” or “step for” or a generic replacement. Prong A is met because: the claim element “means”, which is a generic place holder for “means” (B) The “means for” or “step for” is modified by functional language: Prong B is met because: the generic place holder “means for” is modified by functional language “injecting”. (C) The phrase “means for” or “step for” is not modified by sufficient structure, material, or acts for achieving the specified function. Prong C is met because: the claim element “means for” is not further modified by sufficient structure of material for performing the claimed function “injecting a joining material”. Because this/these claim limitation(s) is/are being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, it/they is/are being interpreted to cover the corresponding structure described in the specification as performing the claimed function, and equivalents thereof. If applicant does not intend to have this/these limitation(s) interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph, applicant may: (1) amend the claim limitation(s) to avoid it/them being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph (e.g., by reciting sufficient structure to perform the claimed function); or (2) present a sufficient showing that the claim limitation(s) recite(s) sufficient structure to perform the claimed function so as to avoid it/them being interpreted under 35 U.S.C. 112(f) or pre-AIA 35 U.S.C. 112, sixth paragraph. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 7-11 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. In claim 7, the limitation “a press element adapted to block an upper seal on the rotor body” is confusing because it is unknown how a press element blocks an upper seal on the rotor body. As best understood, it appears that the limitation actually intends that “a press element adapted to block the spaces on the rotor body by an upper seal, or the like. Claims 8-11 depend on claim 7. Therefore, claims 7-11 are rejected. Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. Claim(s) 1-3 and 5-11 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Matsubayashi (US 20140151926). Regarding claim 1, Matsubayashi teaches, method for assembling an electric machine rotor (resin sealing permanent magnets in a laminated rotor core using the resin sealing apparatus, Figs. 2 and 8, para. [0050]), including a rotor body (rotor core 36, annotated Fig. 2 below) and magnetic pole elements (permanent magnets 47), said method including steps of: [AltContent: textbox (bearing element)][AltContent: ][AltContent: textbox (support)][AltContent: ][AltContent: textbox (rotor)][AltContent: textbox (lower seal)][AltContent: arrow][AltContent: arrow] PNG media_image1.png 762 555 media_image1.png Greyscale Annotated Fig. 2, Matsubayashi. positioning the rotor body and the magnetic pole elements on a support (lower-die support member 17, first step, Fig. 8a, para. [0008]) in such a way that they define between them spaces (see, magnet insertion holes 46, Fig. 3, magnet insertion holes 46 having a rectangular cross section provided in an outer peripheral portion thereof, and permanent magnets 47 having cross-sectional dimensions slightly smaller, para. [0037]) closed on the support side by a lower seal (lower die 29, laminated rotor core 36 is placed on the carrier tray 35, and the prescribed permanent magnets 47 are put respectively into the magnet insertion holes 46…since the permanent magnets 47 are inserted in the magnet insertion holes 46 with the lower surfaces of the magnets 47 coincided with the lower edges of the holes 46, there is a slight difference in level…which ensures contact of the upper surface of the laminated rotor core 36 with the upper die 37, para. [0051-0056]), placing an upper seal (upper die 37, Fig. 8b) on the rotor body and the magnetic pole elements so that it closes the spaces (see Figs. 4 and 8c) on the side opposite to the support (second step, para. [0008], laminated rotor core 36 set on the carrier tray 35 is pressed against the upper die 37…the space G between the upper die 37 and the middle stationary plate 62 becomes null, para. [0054]), injecting a joining material into the spaces (the material of the thermosetting resin is once liquefied by heating, and the resin is filled in the magnet insertion holes 46, para. [0057]) through holes (magnet insertion holes 46) made in at least one of the lower seal and upper seal (para. [0057]). Regarding claim 2, Matsubayashi teaches the recited limitation with respect to claim 1. Matsubayashi further teaches, the assembly method according to claim 1, wherein the lower seal is positioned on a bearing element (heat insulating plate 28, alternatively, receiving plate 42, annotated Fig. 2) and wherein elastically deformable means (springs 34, see Fig. 5) are interposed between the bearing element and the support (see Fig. 5). Regarding claim 3, Matsubayashi teaches the recited limitation with respect to claim 1. Matsubayashi further teaches, the assembly method according to claim 1, wherein, after the step of positioning the rotor body and the magnetic pole elements on the support (see Fig. 8c), there is a step of blocking in position the rotor body and the magnetic pole elements by a clamping stop (jack 18, Fig. 4) sandwiching the rotor body and the magnetic pole elements with the support (vertically movable output shaft 23 of the worm jack 18 is coupled to the lower-die support member 17, para. [0030]; lower die 29 is elevated by the worm jack 18 via the lower-die support member 17 so that the laminated rotor core 36 set on the carrier tray 35 is pressed against the upper die 37, para. [0054], see Figs. 8b to 8c). Regarding claim 5, Matsubayashi teaches the recited limitation with respect to claim 1. Matsubayashi further teaches, the assembly method according to claim 1, wherein after the step of positioning the rotor body and the magnetic pole elements on the support, there is a step of compressing the lower and upper seals against the rotor by a press element (upper die pairing with the lower die and having resin reservoir pots; a third step of pressing and heating the laminated rotor core by the upper die and the lower die, para. [0008]) adapted to bear against the upper seal. Regarding claim 6, Matsubayashi teaches the recited limitation with respect to claim 1. Matsubayashi further teaches, electric machine rotor including a rotor body and magnetic pole elements assembled via an assembly method according to claim 1 (see abstract). Regarding claim 7, Matsubayashi teaches, tool for assembling an electric machine rotor (resin sealing permanent magnets in a laminated rotor core using the resin sealing apparatus, Fig. 8, para. [0050]) including a rotor body (rotor core 36, Fig. 2) and magnetic pole elements (permanent magnets 47), said tool including: a bearing element (heat insulating plate 28, alternatively, receiving plate 42, annotated Fig. 2) adapted to receive a lower seal (lower die 29), a support (lower-die support member 17) adapted to receive the rotor body and the magnetic pole elements in such a way that they define between them spaces (see, magnet insertion holes 46, Fig. 3) closed on the support side by the lower seal, a press element (upper-die main body 45, alternatively, auxiliary block 38) adapted to block an upper seal (upper die 37) on the rotor body and on the magnetic pole elements, so that it closes the spaces on the side opposite to the support, and means for injecting a joining material into said spaces, through holes made in at least one of the lower seal and upper seal (the material of the thermosetting resin is once liquefied by heating, and the resin is filled in the magnet insertion holes 46, para. [0057]). Regarding claim 8, Matsubayashi teaches the recited limitation with respect to claim 7. Matsubayashi further teaches, the assembly tool according to claim 7, further comprising elastically deformable means (springs 34, see Fig. 5) interposed between the bearing element and the support (see Fig. 5). Regarding claim 9, Matsubayashi teaches the recited limitation with respect to claim 7. Matsubayashi further teaches, the assembly tool according to claim 7, further comprising a clamping stop (jack 18, Fig. 4) adapted to sandwich the rotor body and the magnetic pole elements with the support (see para. [0054], Figs. 8b and 8c). Regarding claim 10, Matsubayashi teaches the recited limitation with respect to claim 7. Matsubayashi further teaches, the assembly tool according to claim 7, wherein the press element has a distribution duct (resin passages 51) into which the injection means open and which allows to spread the joining material towards each of said holes (resin passages 51 respectively connected to the resin reservoir pots 50 for leading a liquefied resin material from the pots 50 to the magnet insertion holes 46, para. [0038]). Regarding claim 11, Matsubayashi teaches the recited limitation with respect to claim 7. Matsubayashi further teaches, the assembly tool according to claim 10, wherein said distribution duct has a circular shape and the press element has injection shafts (vertically moving plunger 52) which open, on one side, into said distribution duct, and on the other towards said holes (eight plungers 52 push the melted resin material (i.e., the thermosetting resin) out of the resin reservoir pots 50, thereby filling the respective magnet insertion holes 46, para. [0055]). Claim(s) 1 alternatively and claim 4 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Yamada (US 20190341819). [AltContent: textbox (upper seal)][AltContent: arrow][AltContent: textbox (support)][AltContent: arrow][AltContent: textbox (lower seal)][AltContent: ][AltContent: textbox (rotor)][AltContent: arrow] PNG media_image2.png 431 492 media_image2.png Greyscale Annotated Fig. 8, Yamada. Regarding claim 1, Yamada teaches, method for assembling an electric machine rotor (rotor of an electric motor includes a rotor core, Fig. 8, para. [0005]), including a rotor body (rotor 10, Fig. 8) and magnetic pole elements (plurality of magnets 16), said method including steps of: positioning the rotor body and the magnetic pole elements on a support (first mold 82) in such a way that they define between them spaces (gap G in the axial section of the magnets 16, see Fig. 4 and the cavity 90, Fig. 8, para. [0030]) closed on the support side by a lower seal (see annotated Fig. 8, Fig. 8, step S2 and S3, inserts the assembly 70 made at step S2 into the cavity 90 of the first mold 82, so that the axially front end face 34 of the rotor core 14 contacts a bottom face 98 which defines the cavity 90, para. [0054-0058, 0063]), placing an upper seal (lower mold 84, Fig. 8) on the rotor body and the magnetic pole elements so that it closes the spaces (see Fig. 8) on the side opposite to the support (see Fig. 8), injecting a joining material into the spaces (hot runner 88 includes a heater (not shown), and delivers the resin supplied from the resin supply unit 86, along with the resin being kept in a liquid state, para. [0060]) through holes (gap G, or cavity 90, Figs. 4 and 8) made in at least one of the lower seal and upper seal (resin 56 is filled in a gap G formed between the outer peripheral surface 22 of the rotor core 14 and an inner peripheral surface 66 of the cover tube 54, and between outer surfaces 68 of the magnets 52 and the inner peripheral surface 66, para. [0039]). Regarding claim 4, Yamada teaches the recited limitation with respect to claim 1. Yamada further teaches, the assembly method according to claim 1, wherein the rotor comprising a binding band (cover tube 18, or 18’, Fig. 8, cover tube 18′ is a cylindrical member having a diameter smaller than that of the cover tube 18… the manufacturer fits the cover tube 18′ over the magnets 16 fixed on the rotor core 14 so as to surround the magnets 16 from radially outside, para. [0050]) located on the contour of the magnetic pole elements, during the positioning step, the binding band is positioned on the support, and after the placing step, the upper seal and the lower seal close spaces located between the binding band and the magnetic pole elements, on the support side and on the side opposite to the support (see Fig. 10, the axially front end face 34 of the rotor core 14, the axially front end faces 32 of the magnets 16, and the axially front end face 36 of the cover tube 18′ are in surface-contact with the bottom face 98 of the cavity 90, para. [0064]). Conclusion Prior art Kato (US 8951030) teaches, a method and a tool for assembling an electric machine rotor including a rotor body and magnetic pole elements, said tool including: a bearing element having a lower seal, a support having spaces closed on the support side by the lower seal, a press element to block an upper seal on the rotor body and on the magnetic pole elements, and injecting a joining material into said spaces, through holes made in at least one of the lower seal and upper seal. Prior art Shingu (US 20200153320) teaches, a method and a tool for assembling an electric machine rotor including: a bearing element having a lower seal, a support having spaces closed on the support side by the lower seal, a press element to block an upper seal on the rotor body and on the magnetic pole elements, and injecting a joining material into said spaces, through holes made in at least one of the lower seal and upper seal. Prior art Fukuyama (US 20190044423) teaches, a method and a tool for assembling an electric machine rotor including: a bearing element having a lower seal, a support having spaces closed on the support side by the lower seal, a press element to block an upper seal on the rotor body and on the magnetic pole elements, and injecting a joining material into said spaces, through holes made in at least one of the lower seal and upper seal. Any inquiry concerning this communication or earlier communications from the examiner should be directed to JOSE K. ABRAHAM whose telephone number is (571)270-1087. The examiner can normally be reached Monday-Friday 8:30-4:30 EST. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, THOMAS J. HONG can be reached at (571) 272-0993. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /JOSE K ABRAHAM/Examiner, Art Unit 3729
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Prosecution Timeline

Feb 02, 2024
Application Filed
Oct 16, 2026
Non-Final Rejection mailed — §102, §112 (current)

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Prosecution Projections

1-2
Expected OA Rounds
84%
Grant Probability
99%
With Interview (+32.5%)
2y 9m (~1m remaining)
Median Time to Grant
Low
PTA Risk
Based on 382 resolved cases by this examiner. Grant probability derived from career allowance rate.

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