Prosecution Insights
Last updated: May 29, 2026
Application No. 18/497,520

Hydrogen-Ready Closure Door for Pipeline Use

Non-Final OA §102
Filed
Oct 30, 2023
Priority
Oct 28, 2022 — provisional 63/381,493
Examiner
DUNWOODY, AARON M
Art Unit
3679
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Tdw Delaware Inc.
OA Round
1 (Non-Final)
75%
Grant Probability
Favorable
1-2
OA Rounds
2m
Est. Remaining
87%
With Interview

Examiner Intelligence

Grants 75% — above average
75%
Career Allowance Rate
1217 granted / 1621 resolved
+23.1% vs TC avg
Moderate +12% lift
Without
With
+11.5%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
39 currently pending
Career history
1656
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
20.0%
-20.0% vs TC avg
§102
63.3%
+23.3% vs TC avg
§112
13.5%
-26.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1621 resolved cases

Office Action

§102
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 § 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) 1-6, 8-10, 12 and 15 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by US 20120234834, Akhund. In regards to claim 1, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses a closure for pipelines carrying a fluid under pressure, the closure comprising a door (12), a barrel collar having a horizontal sealing face (near 40) and a vertical sealing face (50) relative to the door; and at least one clamp ring (14) adapted to capture a circumferential portion of the door and the barrel collar when in a clamped state; the closure further comprising: one or more seals located on the vertical sealing face, the one or more seals (46) being circumferential and arranged to alter a path of a leak pathway between the horizontal sealing face of the barrel collar and an ambient environment outside of the door connected to the barrel collar and to cause a pressure drop across the one or more seals. In regards to claim 2, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the horizontal sealing face of the barrel collar including (in contact with) a primary seal (40) adapted to seal the door against the barrel collar. In regards to claim 3, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the primary seal and the one or more seals are arranged coaxial with the barrel collar. In regards to claim 4, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the one or more seals has a higher durometer than that of the primary seal ([0019]). In regards to claim 5, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the one or more seals has a smaller cross-sectional diameter than the primary seal. In regards to claim 6, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the primary seal lies in a different plane than the one or more seals. In regards to claim 8, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses a groove in either the barrel collar or the door adapted to receive a corresponding seal of the one or more seals. In regards to claim 9, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses the groove is of a compressive design. In regards to claim 10, in Figures 4-5 and paragraphs detailing said figures, Akhund discloses one of the one or more seals is composed of a hydrogen reliable material. In regards to claim 12, in Figures 4-5 and paragraphs [0018]-[0020], Akhund discloses a method for reducing an escape of fluid through a pipeline closure, the method comprising: arranging one or more seals on a vertical sealing face of a barrel collar along a leak pathway located between a horizonal sealing face of the barrel collar and an ambient environment outside of a closure door connected to the barrel collar so that a path of an escaping fluid along the leak pathway is non-linear and a pressure drop (inherent) occurs over the one or more seals. In regards to claim 15, in Figures 4-5 and paragraphs [0018]-[0020], Akhund discloses the closure includes a primary seal on a horizontal sealing face of the barrel collar. Allowable Subject Matter Claims 7, 11, 13, 14 and 16-19 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. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to AARON M DUNWOODY whose telephone number is (571)272-7080. The examiner can normally be reached Monday - Friday 9:00 am - 6:00 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, 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. /AARON M DUNWOODY/Primary Examiner, Art Unit 3679
Read full office action

Prosecution Timeline

Oct 30, 2023
Application Filed
Nov 15, 2023
Response after Non-Final Action
Feb 05, 2026
Non-Final Rejection mailed — §102 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12638110
FLUID ADAPTOR
1y 6m to grant Granted May 26, 2026
Patent 12638114
HOSE JOINT
9m to grant Granted May 26, 2026
Patent 12631272
HOUSING ASSEMBLY FOR USE IN A HEAT EXCHANGE SYSTEM
1y 5m to grant Granted May 19, 2026
Patent 12624779
A PIPE COUPLING FOR CONNECTING CIRCULAR ELEMENTS
1y 6m to grant Granted May 12, 2026
Patent 12624780
MECHANICAL JOINT RESTRAINT WITH WEDGE ASSEMBLIES INCLUDING COLLAR BOLTS
1y 3m to grant Granted May 12, 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
75%
Grant Probability
87%
With Interview (+11.5%)
2y 9m (~2m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1621 resolved cases by this examiner. Grant probability derived from career allowance rate.

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