Prosecution Insights
Last updated: July 17, 2026
Application No. 18/023,477

COIL FOR A TRANSFORMER CORE

Non-Final OA §102§103§112
Filed
Feb 27, 2023
Priority
May 05, 2021 — EU 21382405.5 +1 more
Examiner
NGUYEN, TUYEN T
Art Unit
2837
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Hitachi Ltd.
OA Round
1 (Non-Final)
81%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
82%
With Interview

Examiner Intelligence

Grants 81% — above average
81%
Career Allowance Rate
1014 granted / 1245 resolved
+13.4% vs TC avg
Minimal +1% lift
Without
With
+0.9%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
57 currently pending
Career history
1306
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
82.5%
+42.5% vs TC avg
§102
5.6%
-34.4% vs TC avg
§112
5.8%
-34.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1245 resolved cases

Office Action

§102 §103 §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 . 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 1-20 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. Regarding claim 1, applicant should clarify the structure and/or arrangement of the coil for a transformer coil intended by “at least one multi-stranded conductor, at least one first conductor turn… at least one second conductor turn.” Are these conductor turns different or the same of the multi-stranded conductor? Does the multi-stranded conductor, the first conductor turn and the second conductor turn is/are the same or different? Applicant should clarify. Claims 2-15 inherit the defect of the parent claim. Regarding claim 16, applicant should clarify the structure and/or arrangement of the coil for a transformer coil intended by “at least one multi-stranded conductor, at least one first conductor turn… at least one second conductor turn.” Are these conductor turns different or the same of the multi-stranded conductor? Does the multi-stranded conductor, the first conductor turn and the second conductor turn is/are the same or different? Applicant should clarify. Claims 17-20 inherit the defect of the parent claim. Claim Rejections - 35 USC § 102 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)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claim(s) as best understood in view of the rejection under 35 USC 112 second paragraph is/are rejected under 35 U.S.C. 102(a)(2) as being anticipated by Ponweiser et al. [US 6563413 B1]. Regarding claims 1-2 and 13, Ponweiser et al. discloses a coil [6] for a transformer core [figure 5, column 6, lines 43-46], comprising: a longitudinal axis [figure 5], at least one multi-stranded conductor [7], at least one first conductor turn [figure 5] wound around the longitudinal axis, at least one second conductor turn [figure 5] wound around the longitudinal axis, the at least one first conductor turn being adjacent the at least one second conductor turn, wherein each of the at least one first and second conductor turns is provided with an electrically insulating member [4] which extends about part but not an entire cross-sectional perimeter of the respective conductor turn, such that the at least one first and second conductor turns are insulated against each other [figure 5], wherein of two axially and/or radially adjacent conductor turns each turn has one side surface facing a side surface of the respective adjacent turn, while only one of these surfaces facing one another is provided with the electrically insulating member fully extending along said side surface while the other one of the two side surfaces facing one another is not provided with an electrically insulating member or is provided with an electrically insulating member extending along only part of said side surface [figures 1-5], wherein the at least one first conductor turn (22) and the at least one second conductor turn (24) are axially and/or radially adjacent to one another [figures 1-5]. Regarding claim 5, Ponweiser et al. discloses the electrically insulating member only extends around less than 80% of the perimeter of the respective conductor turn, preferably less than 60%, more preferably less than 50% [figures 1-3] Regarding claim 6-8, Ponweiser et al. discloses one side surface of the of the respective conductor turn is not provided with the electrically insulating member [figures 1-5], wherein the multi-stranded conductor is a litz wire [conductor 2 coated with enamel insulation 3], wherein the electrically insulating member comprises or consists of aramid fibers [paper]. Regarding claim 9, Ponweiser et al. further discloses a holding element [5] for holding the electrically insulating member to the respective conductor turn. Regarding claim 14, Ponweiser et al. discloses the use of the winding in a oil filled type transformer [background] which include a magnetic core. Ferromagnetic core is a known magnetic material use for the core in the transformer. Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claim(s) 3-4, 10-12 and 16-20 is/are rejected under 35 U.S.C. 103 as being unpatentable over Ponweiser et al. in view of Zhang et al. [CN 205692663]. Regarding claim 10, Ponweiser et al. disclose the instant claimed invention except for the use of resin. Zhang et al. discloses the use of resin material for insulation in conductor of a coil structure. It would have been an obvious to one having ordinary skill in the art, before the effective filing date of the claimed invention, to use resin for the holding element of Ponweiser et al., as suggested by Zhang et al., for the purpose of facilitating embedding/molding/adhesive and improve insulation. Regarding claim 12, Ponweiser discloses mesh insulation [5] embedding/covering the conductor turn. Zhang et al. discloses the use of resin material for insulation in conductor of a coil structure. It would have been an obvious to one having ordinary skill in the art, before the effective filing date of the claimed invention, to use resin for the mesh covering of Ponweiser et al., as suggested by Zhang et al., for the purpose of facilitating embedding/molding/adhesive and improve insulation. Regarding claim 16, Ponweiser et al. discloses coil [6] for a transformer core [figure 5, column 6, lines 43-46, comprising: a longitudinal axis [figure 5], at least one multi-stranded conductor [7], at least one first conductor turn [figures 1-5] wound around the longitudinal axis, at least one second conductor turn [figures 1-5] wound around the longitudinal axis, the at least one first conductor turn being adjacent the at least one second conductor turn, and a mesh member [5] embedding/covering the respective conductor turns, wherein each of the at least one first and second conductor turns is provided with an electrically insulating member [4] which extends about part but not an entire cross-sectional perimeter of the respective conductor turn, such that the at least one first and second conductor turns are insulated against each other, and wherein the at least one first conductor turn and the at least one second conductor turn are axially and/or radially adjacent to one another [figures 1-3]. Ponweiser et al. disclose the instant claimed invention except for the use of resin. Zhang et al. discloses the use of resin material for insulation in conductor of a coil structure. It would have been an obvious to one having ordinary skill in the art, before the effective filing date of the claimed invention, to use resin for the mesh covering of Ponweiser et al., as suggested by Zhang et al., for the purpose of facilitating embedding/molding/adhesive and improve insulation. Regarding claim 17, Ponweiser et al. discloses a holding element [same as mesh covering 5] that use for holding the electrically insulating member to the respective conductor turn [figures 1-5]. Zhang et al. discloses the use of resin material for insulation in conductor of a coil structure. It would have been an obvious to one having ordinary skill in the art, before the effective filing date of the claimed invention, to use resin for the mesh covering or holding member of Ponweiser et al., as suggested by Zhang et al., for the purpose of facilitating embedding molding or adhesive and improve insulation. Regarding claim 18, Ponweiser et al. discloses two axially and/or radially adjacent conductor turns each turn has one side surface facing a side surface of the respective adjacent turn, while only one of these surfaces facing one another is provided with the electrically insulating member fully extending along said side surface while the other one of the two side surfaces facing one another is not provided with an electrically insulating member or is provided with an electrically insulating member extending along only part of said side surface [figures 1-5]. Regarding claims 3-4 and 19, the specific “substantially” rectangular cross-section use for the conductor turns would have been an obvious design consideration for the purpose of improving coil density [note, Ponweiser et al. disclose the rounded surfaces for the conductor 7, wherein the majority of at least two side surfaces is not provided with an electrically insulating member 4, figures 1-3]. Regarding claim 11, the specific holding element arrangement relative to the conductor turn would have been an obvious design consideration based on the intended application and/or environment use and/or facilitating insulation/holding. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to TUYEN T NGUYEN whose telephone number is (571)272-1996. The examiner can normally be reached Mon - Fri 8:30-5:30. 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, Shawki Ismail can be reached at 571-272-3985. 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. /TUYEN T NGUYEN/Primary Examiner, Art Unit 2837
Read full office action

Prosecution Timeline

Feb 27, 2023
Application Filed
Jun 02, 2026
Non-Final Rejection mailed — §102, §103, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12683065
COIL COMPONENT
3y 2m to grant Granted Jul 14, 2026
Patent 12665120
REACTOR, CONVERTER, AND POWER CONVERSION DEVICE
3y 9m to grant Granted Jun 23, 2026
Patent 12665121
Stationary Induction Electric Apparatus
3y 7m to grant Granted Jun 23, 2026
Patent 12665124
COIL COMPONENT
3y 5m to grant Granted Jun 23, 2026
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3y 9m to grant Granted Jun 16, 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
82%
With Interview (+0.9%)
2y 7m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1245 resolved cases by this examiner. Grant probability derived from career allowance rate.

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