Prosecution Insights
Last updated: August 17, 2026
Application No. 18/316,219

PRINTED CIRCUIT BOARD BASED WINDING STRUCTURE FOR INDUCTORS

Non-Final OA §103§112
Filed
May 11, 2023
Examiner
NGUYEN, TUYEN T
Art Unit
2837
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Delta Electronics Inc.
OA Round
1 (Non-Final)
82%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
83%
With Interview

Examiner Intelligence

Grants 82% — above average
82%
Career Allowance Rate
1019 granted / 1251 resolved
+13.5% vs TC avg
Minimal +1% lift
Without
With
+1.1%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
56 currently pending
Career history
1308
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
56.5%
+16.5% vs TC avg
§102
19.7%
-20.3% vs TC avg
§112
18.5%
-21.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1251 resolved cases

Office Action

§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 . Election/Restrictions Applicant's election with traverse of Species 2, Figure 6 in the reply filed on 4/21/2026 is acknowledged. The traversal is on the ground(s) that additional coated layer and bobbin structure and the condition under multiple PCB-based inductors are obvious variants to each other. This is not found persuasive because the bobbin structure and the conduction under multiple PCB-based inductors require search and/or consideration in other areas, class/subclass. Claims 1-10 and 13-19 will be examined herewith with none of the claim is generic. The requirement is still deemed proper and is therefore made FINAL. 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 1-10 and 13-19 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 claims 1, 13 and 17, applicant should clarify the structure and/or arrangement of the first and/or second terminals relative to the conductive layers [outermost or centermost layer(s)]. Applicant should also clarify the structure and/or arrangement of the conductive layers intended by “arranged in a staggered pattern”. Claims 2-10 and 14-16 and 18-19 inherit the defect of the parent claim. 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) 1-8 and 13-19, as best understood in view of the rejection under 35 USC 112 second paragraph, is/are rejected under 35 U.S.C. 103 as being unpatentable over Akagi [JP S58-124916 U]. Regarding claim 1, Akagi discloses a PCB-based inductor [figures 1-4], comprising: - an insulating planar board having a central through hole; a plurality of conductive layers embedded in the insulating planar board and stacked on top of each other, the conductive layers being electrically connected with each other through one or more buried vias, each of the conductive layers being patterned to have a spiral shape around the central through hole and arranged in an annulus region having an annular radius; a first terminal electrically coupled to outermost ones of the conductive layers; and a second terminal electrically coupled to a centermost one of the conductive layers; wherein the conductive layers are arranged in a staggered pattern. 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) 1-8 and 13-19, as best understood in view of the rejection under 35 USC 112 second paragraph, is/are rejected under 35 U.S.C. 103 as being unpatentable over Yang [CN 206287941] in view of Akagi [JP S58-124916 U]. Regarding claims 1, 7 and 13, Yang discloses a PCB-based inductor [figures 1-3], comprising: - an insulating planar board having a central through hole [figures 1-3]; - a plurality of conductive layers [13, 23, 33] embedded in the insulating planar board and stacked on top of each other, the conductive layers being electrically connected with each other through one or more buried vias, each of the conductive layers being patterned to have a spiral shape around the central through hole, the conductive layers increases from the centermost one of the conductive layers to the outermost ones of the conductive layers [figure 3]; - terminals for internal/external connections, wherein the conductive layers are arranged in a staggered pattern and the conductive layers are spatially separated in a vertical direction [figure 3]. Yang discloses the instant claimed invention except for the specific of the conductive layers and terminals. Akagi discloses a PCB-based inductor [figures 1-5] comprising: - a PCB-based coil structure [figures 1-2 and 4] including a plurality of conductive layers arranged in staggered [or offset] arrangement [figures 3 and 5]; and - terminals [2a/6a, 10/4a, 5a/9b, 12a/16a, 28/14a, 23a/14a, figures 1-2 and 4-5], wherein the one of the terminals connected to “outermost layer” and other terminal connected to “center layer” [figures 2 and 5]. 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 the terminal connections and/or arrangement of Akagi in Yang for the purpose of improving internal/external connections and tapping. The specific anulus pattern/shape of the spiral conductive layers would have been an obvious design consideration based on the intended application and/or environment uses. Regarding claims 2-3, 6, 16 and 18-19, Yang discloses the staggered pattern is in different shapes staggered pattern [figures 2-3]. The specific concave stagger pattern would have been an obvious design consideration based on the intend inductance and/or magnetic flux/field desired. Regarding claims 4-5, 14-15 and 17, Akagi discloses a winding extension protruding from an edge of the conductive layers [figures 1-2 and 4-5], wherein the second terminal is electrically coupled to the centermost one of the conductive layers through the winding extension [figures 1-2 and 4-5]. Regarding claim 8, Yang discloses comprising a magnetic core [11/12, 21/22, 31/32] magnetically coupled to the conductive layers. Claim(s) 9-10 is/are rejected under 35 U.S.C. 103 as being unpatentable over Yang in view of Akagi as applied to claims 1 and 8 above, and further in view of Sun et al. [CN 210516439 U] Regarding claims 9-10, Yang in view of Akagi disclose the instant claimed invention except for the magnetic core is electrical connected to the first terminal. Sun et al discloses a magnetic device [figure 1, abstract] comprising: - a core structure [3] coated with a conductive layer [6]; - a coil [4] having ends wound about the magnetic core; and - grounding terminal [5, 51] electrically connected to the core structure at the conductive layer. It would have been an obvious to one having ordinary skill in the art, before the effective filing date of the claimed invention, to connect the terminal to the magnetic core of Yang in view of Akagi, as suggested by Sun et al. for the purpose of improving grounding. 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

May 11, 2023
Application Filed
Jul 17, 2026
Non-Final Rejection mailed — §103, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12700536
A TRANSFORMER ARRANGEMENT
1y 11m to grant Granted Aug 04, 2026
Patent 12695021
SYMMETRIC SPLIT TRANSFORMER FOR EMI REDUCTION
5y 8m to grant Granted Jul 28, 2026
Patent 12695020
INDUCTOR AND ELECTRONIC DEVICE
3y 10m to grant Granted Jul 28, 2026
Patent 12695019
ELECTRIC DEVICE WITH FORCED DIRECT COOLING
3y 6m to grant Granted Jul 28, 2026
Patent 12688967
INDUCTOR DEVICE
4y 7m to grant Granted Jul 21, 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
82%
Grant Probability
83%
With Interview (+1.1%)
2y 7m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1251 resolved cases by this examiner. Grant probability derived from career allowance rate.

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