Prosecution Insights
Last updated: October 25, 2026
Application No. 18/434,670

HYBRID DRUM SHELLS AND RELATED METHODS

Non-Final OA §103
Filed
Feb 06, 2024
Priority
Dec 22, 2023 — provisional 63/614,037
Examiner
LOCKETT, KIMBERLY R
Art Unit
2837
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Drum Workshop Inc.
OA Round
2 (Non-Final)
82%
Grant Probability
Favorable
2-3
OA Rounds
0m
Est. Remaining
94%
With Interview

Examiner Intelligence

Grants 82% — above average
82%
Career Allowance Rate
986 granted / 1195 resolved
+14.5% vs TC avg
Moderate +11% lift
Without
With
+11.1%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 10m
Avg Prosecution
30 currently pending
Career history
1232
Total Applications
across all art units

Statute-Specific Performance

§101
1.0%
-39.0% vs TC avg
§103
45.7%
+5.7% vs TC avg
§102
21.6%
-18.4% vs TC avg
§112
25.3%
-14.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1195 resolved cases

Office Action

§103
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 § 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. Claims 1 and 9-13 are rejected under 35 U.S.C. 103 as being unpatentable over Park (US 20220128386). Regarding claim 1, US 20220128386 discloses the use of a drum shell comprising a first wood ply (104), a second wood ply (102), US 20220128386 does not disclose the use of a non-wood ply between said first and second wood plies. However, it would have been obvious to one of ordinary skill in the art prior to the effective filing date to modify the shell as disclosed in Park to include a non-wood ply since Park discloses that one of his layers can be made from a non-wood ply (see paragraph 0030). Regarding claim 9, Park does not disclose the use of a mating surface of said non-wood ply is attached to said first wood ply, and wherein said mating surface is roughened. However, it would have been obvious to one of ordinary skill in the art prior to the effective filing date to modify the mating surface as disclosed in Park to include a roughened surface since roughen surfacse are well known surfaces for mating materials. Regarding claim 10, Park does not disclose a specific non-wood volume of said drum shell. However, it would have been obvious to one of ordinary skill in the art prior to the effective filing date to modify the volume of said drum shell as disclosed in Park to incuse a specific volume as a matter of design choice. Regarding claims 11 and 12, Park further discloses that any of his layers can comprises a material selected from the group of metal, carbon fiber, plastic, and fiberglass (paragraph 0030). Regarding claim 13, Park does not disclose wherein said non-wood ply is aluminum. However, it would have been obvious to one of ordinary skill in the art prior to the effective filing date to modify the drum shell as disclosed in Park to include aluminum since the use of aluminum is conventional and well known in the art. Claims 2-8 are objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Claims 14-27 are allowed. Any inquiry concerning this communication or earlier communications from the examiner should be directed to KIMBERLY R LOCKETT whose telephone number is (571)272-2067. The examiner can normally be reached 8:30-5:00 pm M-F. 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, Dedei Hammond can be reached at 571-270-7938. 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. /KIMBERLY R LOCKETT/Primary Examiner, Art Unit 2837
Read full office action

Prosecution Timeline

Feb 06, 2024
Application Filed
May 20, 2026
Non-Final Rejection mailed — §103
Aug 10, 2026
Response Filed
Oct 21, 2026
Non-Final Rejection mailed — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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Bent Steel Saddle for S-Style Guitar
2y 4m to grant Granted Oct 13, 2026
Patent 12749468
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2y 3m to grant Granted Sep 29, 2026
Patent 12731562
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2y 5m to grant Granted Sep 08, 2026
Patent 12725587
PLECTRUM WITH FOAM PAD ADHESIVE
2y 6m to grant Granted Sep 01, 2026
Patent 12718782
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2y 7m to grant Granted Aug 25, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

2-3
Expected OA Rounds
82%
Grant Probability
94%
With Interview (+11.1%)
1y 10m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1195 resolved cases by this examiner. Grant probability derived from career allowance rate.

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