Prosecution Insights
Last updated: July 17, 2026
Application No. 18/903,403

DOWN-THE-HOLE DRILL HAMMER HAVING A COAXIAL ACCUMULATOR

Final Rejection §102§Other
Filed
Oct 01, 2024
Priority
Oct 03, 2023 — provisional 63/587,525
Examiner
WALLACE, KIPP CHARLES
Art Unit
3674
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Center Rock Inc.
OA Round
4 (Final)
78%
Grant Probability
Favorable
5-6
OA Rounds
11m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
728 granted / 928 resolved
+26.4% vs TC avg
Strong +25% interview lift
Without
With
+25.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
14 currently pending
Career history
945
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
88.6%
+48.6% vs TC avg
§102
2.7%
-37.3% vs TC avg
§112
2.6%
-37.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 928 resolved cases

Office Action

§102 §Other
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 . Response to Arguments Applicant's arguments filed 03/20/2026 have been fully considered but they are not persuasive. Applicant’s argument that integration of 730 into 710 requires relocation or removal of top sub/backhead 715 is not persuasive. Element 715 would stay where it is, right above 710, acting as a backhead when element 730 is integrated into 710 as taught by Wood. No relocation or removal of element 715 occurs when element 730 is integrated into 710 since Wood does not disclose relocation of removal of element 715 upon such integration. Applicant’s argument that element 715 serves an important purpose in connecting 730 to 710 and would then also be integrated into 710 is not persuasive since no such language appears in Wood nor is this a well-known occurrence in the art. 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)(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) 14-16 is/are rejected under 35 U.S.C. 102a1 as being anticipated by Underwood (US 20070284010 A1), hereinafter Wood. With respect to claim 14, Wood discloses a down-the-hole drill hammer comprising: a housing (150); a backhead (715) connected to the housing, an accumulator (combination of at least portion of 345 between seals 355 and lower end of 115, 115, and 351) housed within the housing downstream of the backhead (shown in fig. 5, when integrated into 710 the accumulator will be downstream of backhead 715 since 710 is downstream of 715), the accumulator including: and an accumulator housing (351), a liner within the housing (portion of 345 between seals 355 and lower end of 115), and a flexible diaphragm (115) within the housing circumscribing the liner (shown in fig. 5) and a piston (712) reciprocating in the housing (. With respect to claims 15 and 16, Wood discloses wherein the diaphragm includes annular protrusions (shown at upper and lower ends of 115 in fig. 5, extending inwardly to seal against liner) and a plurality of radially directed apertures (374) along the length of the liner between the protrusions (fig. 5), and wherein the diaphragm hermetically seals the liner (pgph. 46, fig. 5). Allowable Subject Matter Claim 1-13, 18-20 allowed. Claim 17 is 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. Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to KIPP CHARLES WALLACE whose telephone number is (571)270-1162. The examiner can normally be reached Monday - Friday 12:00 PM - 8:00 PM. 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, Doug Hutton can be reached at (571) 272-4137. 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. /KIPP C WALLACE/Primary Examiner, Art Unit 3674 05/28/2026
Read full office action

Prosecution Timeline

Show 5 earlier events
Dec 17, 2025
Response after Non-Final Action
Jan 07, 2026
Examiner Interview (Telephonic)
Jan 12, 2026
Non-Final Rejection mailed — §102, §Other
Mar 12, 2026
Interview Requested
Mar 17, 2026
Applicant Interview (Telephonic)
Mar 17, 2026
Examiner Interview Summary
Mar 20, 2026
Response Filed
Jun 02, 2026
Final Rejection mailed — §102, §Other (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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4y 0m to grant Granted Jun 30, 2026
Patent 12669050
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Patent 12655700
Method and Apparatus for Setting Downhole Plugs and Other Objects in Wellbores
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Patent 12644348
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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

5-6
Expected OA Rounds
78%
Grant Probability
99%
With Interview (+25.3%)
2y 9m (~11m remaining)
Median Time to Grant
High
PTA Risk
Based on 928 resolved cases by this examiner. Grant probability derived from career allowance rate.

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