Prosecution Insights
Last updated: April 19, 2026
Application No. 18/565,714

HOLLOW SHAFT FOR AN ELECTRIC MOTOR

Non-Final OA §102§103
Filed
Mar 20, 2024
Examiner
BINDA, GREGORY JOHN
Art Unit
3679
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
BENTELER Steel/Tube GmbH & Co. KG
OA Round
1 (Non-Final)
81%
Grant Probability
Favorable
1-2
OA Rounds
2y 8m
To Grant
93%
With Interview

Examiner Intelligence

Grants 81% — above average
81%
Career Allow Rate
1456 granted / 1798 resolved
+29.0% vs TC avg
Moderate +12% lift
Without
With
+11.7%
Interview Lift
resolved cases with interview
Typical timeline
2y 8m
Avg Prosecution
41 currently pending
Career history
1839
Total Applications
across all art units

Statute-Specific Performance

§101
1.9%
-38.1% vs TC avg
§103
19.4%
-20.6% vs TC avg
§102
39.5%
-0.5% vs TC avg
§112
36.4%
-3.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1798 resolved cases

Office Action

§102 §103
Drawings The drawings are objected to because the drawings fail to show solder joining the first and second hollow components as recited in claim 1; and profiling formed as teeth, ribs, grooves and slots on the inner and/or outer circumference of hollow components 7, 8, 9 as described in paragraphs 048 & 058 and recited in claims 15-16. Corrected drawing sheets in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. No new matter may be added. Any amended replacement drawing sheet should include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is being amended. The figure or figure number of an amended drawing should not be labeled as “amended.” If a drawing figure is to be canceled, the appropriate figure must be removed from the replacement sheet, and where necessary, the remaining figures must be renumbered and appropriate changes made to the brief description of the several views of the drawings for consistency. Additional replacement sheets may be necessary to show the renumbering of the remaining figures. Each drawing sheet submitted after the filing date of an application must be labeled in the top margin as either “Replacement Sheet” or “New Sheet” pursuant to 37 CFR 1.121(d). If the changes are not accepted by the examiner, the applicant will be notified and informed of any required corrective action in the next Office action. The objection to the drawings will not be held in abeyance. Specification The disclosure is objected to because the detailed description of the invention fails to describe details corresponding to the limitations of claim 14. The abstract of the disclosure is objected to because it begins with a phrase that can be implied. 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 Rejections - 35 USC § 102 Claim(s) 10, 12-13, 15-16 & 20 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Woody, US 2020/0251963. Claim 10. Woody discloses a hollow shaft (100) for an electric motor (see title), the shaft comprising: a hollow shaft body comprising at least two hollow components (102 & 101, 108), wherein a first hollow component (102) of the at least two hollow components is inside a second hollow component (101, 108) of the at least two hollow components, the first hollow component and the second hollow component are joined together via solder (paragraph 0016), the first hollow component comprises a central through opening having an inner diameter (see Fig. 1) and a further hollow component (104) is inserted into the first hollow component, wherein the further hollow component is joined to an inner circumference of the central through opening of the first hollow component while abutting thereon (see Fig. 1). Claim 12. Fig. 1 shows a bearing seat at least at one end (101) of one of the at least two hollow components. Claim 13. The at least two hollow components (102 & 101, 108) comprise different metallic materials. See copper at paragraph 0015 and iron at paragraph 0038. Claim 15 & 16. Fig. 6 shows at least one (102) of the at least two hollow components comprises a profiling/slots on an inner circumference or an outer circumference thereof. Claim 20. Figs. 1 & 5 show the at least two hollow components are rotationally symmetrical. Claim Rejections - 35 USC § 103 Claims 10-12, 17 & 19-20 are rejected under 35 U.S.C. 103 as being unpatentable over Swars, US 5.165,304 Claim 10. At Fig. 1, Swars shows a hollow shaft (see also title) that could be used for an electric motor (see “various applications” at col 3, line 58), the shaft comprising: a hollow shaft body comprising at least two hollow components (7-9 & 10), wherein a first hollow component (7-9) of the at least two hollow components is inside a second hollow component (10) of the at least two hollow components, the first hollow component and the second hollow component are joined together (see fixed” at col. 3, line 8), the first hollow component comprises a central through opening having an inner diameter and a further hollow component (1) is inserted into the first hollow component, wherein the further hollow component is joined to an inner circumference of the central through opening of the first hollow component while abutting thereon (see fixed” at col. 3, line 8). Swars does not expressly disclose the first hollow component (7-9) and the second hollow component (10) are joined together via solder. However, Swars does disclose at col. 3, lines 20- 23 that hollow components can be joined by solder (53). As such, it would have been obvious to one of ordinary skill in the art to modify the hollow shaft of Swars by using solder to join together the he first hollow component (7-9) and the second hollow component (10). Claim 11. The at least two hollow components further comprise at least one further hollow component (11) positioned on an outer circumference of the first hollow component (7-9). Claim 12. Fig. 1 shows a bearing seat at least at one end (7) of one of the at least two hollow components. Claim 17. Fig. 1 shows a pipe body (5) positioned in the shaft body at a distance from the inner circumference of the first hollow component (7-9). Claim 19. Fig. 1 shows the shaft body is a hollow cylinder. Claim 20. Fig. 1 shows the at least two hollow components are rotationally symmetrical. Claims 10-12, 14 & 17-20 are rejected under 35 U.S.C. 103 as being unpatentable over Linscott, US 4,203,044 in view of Browne, US 492,266. Claim 10. Linscott discloses a hollow shaft for an electric motor (col. 4, lines 10-11), the shaft comprising: a hollow shaft body comprising at least two hollow components (18, 20), wherein a first hollow component (18) of the at least two hollow components is inside a second hollow component (20) of the at least two hollow components, the first hollow component and the second hollow component are joined together (col. 1, lines 23-24 and col. 2, lines 43-44), the first hollow component comprises a central through opening (see Fig. 1) having an inner diameter and a further hollow component (70) is inserted into the first hollow component, wherein the further hollow component is joined to an inner circumference (52) of the central through opening of the first hollow component while abutting thereon. Linscott does not expressly disclose the first hollow component (18) and the second hollow component (20) are joined together via solder. At page 1, lines 53-66, Browne teaches using solder to join coils (i.e. windings 20 of Linscott) in the manufacture of a shaft in order to provide unimpaired union. It would have been obvious to one of ordinary skill in the art to modify the hollow shaft of Linscott by using solder to join together the first hollow component (18) and the second hollow component (20) in order to provide unimpaired union as taught by Browne. Claim 11. Linscott shows the at least two hollow components further comprise at least one further hollow component (22) positioned on an outer circumference of the first hollow component (18). Claim 12. Fig. 1 of Linscott shows a bearing (30) seat at least at one end of one of the at least two hollow components. Claim 14. At page 1, lines 53-54, Browne discloses the solder is copper-based. Claim 17. Fig. 1 of Linscott shows a pipe body (62) positioned in the shaft body at a distance from the inner circumference (50) of the first hollow component (18). Claim 18. At col. 3, lines 56-66 and Figs. 2-3, Linscott discloses the pipe body (92) comprises openings (78) oriented in a longitudinal axis of the shaft body at angle (90 degrees) to the longitudinal axis of the shaft body. Claim 19. Fig. 1 of Linscott shows the shaft body is a hollow cylinder. Claim 20. Fig. 1-3 of Linscott show the at least two hollow components are rotationally symmetrical. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Jackson discloses a hollow cylindrical shaft (10) comprising multiple hollow components (12, 14, 20) joined by solder (col. 3, lines 6-10) Any inquiry concerning this communication or earlier communications from the examiner should be directed to Greg Binda whose telephone number is (571)272-7077. The examiner can normally be reached 9:30-5:30 et. 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, Matthew Troutman can be reached at 571-270-3654. 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. /Greg Binda/Primary Examiner, Art Unit 3679
Read full office action

Prosecution Timeline

Mar 20, 2024
Application Filed
Jan 20, 2026
Non-Final Rejection — §102, §103 (current)

Precedent Cases

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CONSTANT VELOCITY JOINT AND DRIVESHAFT INCLUDING SAME
2y 5m to grant Granted Feb 24, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
81%
Grant Probability
93%
With Interview (+11.7%)
2y 8m
Median Time to Grant
Low
PTA Risk
Based on 1798 resolved cases by this examiner. Grant probability derived from career allow rate.

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