Prosecution Insights
Last updated: April 19, 2026
Application No. 18/854,509

END FACE MECHANICAL SEALING DEVICE, END FACE MECHANICAL SEAL, AND METHOD FOR MOUNTING AN END FACE MECHANICAL SEALING DEVICE

Final Rejection §102
Filed
Oct 04, 2024
Examiner
PATEL, VISHAL A
Art Unit
3675
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Frideco AG
OA Round
2 (Final)
59%
Grant Probability
Moderate
3-4
OA Rounds
3y 1m
To Grant
81%
With Interview

Examiner Intelligence

Grants 59% of resolved cases
59%
Career Allow Rate
483 granted / 820 resolved
+6.9% vs TC avg
Strong +22% interview lift
Without
With
+21.7%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
47 currently pending
Career history
867
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
36.8%
-3.2% vs TC avg
§102
33.0%
-7.0% vs TC avg
§112
25.7%
-14.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 820 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 . Response to Arguments Applicant's arguments filed on 1/21/2026 have been fully considered but they are not persuasive. Applicants argument that claim 1 is amended to add limitation of claim 9 and is not taught by Vedovell is not persuasive since Vedovell teaches limitation of a mechanical device having an elastic element 27, a housing unit 10, a support element 18 and/or 19 for pretensioning the elastic element in the housing unit, an intermediate element (e.g. 21) for transmitting force to the elastic element, which intermediate element is arranged between the elastic element and the support element (e.g. see figures). It is noted that each and every structure of the claims are taught by Vedovell. Applicant argument with regard to intended use (applicants’ specification p.10, 1.2-12) of a support element and/or intermediate element to a slide ring is not persuasive since applicant is broadly claiming a mechanical device having a housing unit, an elastic element, a support element and an intermediate element which are taught by Vedovell. Applicants argument that claim 1 is amended to add limitation of claim 9 and is not taught by Dahlheimer is not persuasive since Dahlheimer teaches limitation of a mechanical device having an elastic element 48, a housing unit 20, a support element 50 for pretensioning the elastic element in the housing unit, an intermediate element 42c for transmitting force to the elastic element, which intermediate element is arranged between the elastic element and the support element (e.g. see figures). It is noted that each and every structure of the claims are taught by Dahlheimer. Applicant argument with regard to intended use (applicants’ specification p.10, 1.2-12) of a support element and/or intermediate element to a slide ring is not persuasive since applicant is broadly claiming a mechanical device having a housing unit, an elastic element, a support element and an intermediate element which are taught by Dahlheimer. 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) 1-8 and 10-14 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Vedovell et al (US. 2089773). Vedovell discloses a mechanical sealing device (figures) having an elastic element (e.g. 27) and a housing unit (e.g. 10), further comprising a support element (e.g. 18 and/or 19) for pretensioning the elastic element in the housing unit. Wherein the mechanical sealing device further comprising an intermediate element (e.g. 21) for transmitting force to the elastic element, which intermediate element is arranged between the elastic element and the support element (e.g. see figures). Regarding claim 2: Wherein the housing unit has a recess (e.g. 20) for accommodating the support element. Regarding claim 3: Wherein the recess (e.g. 20) is formed at least in sections as an annular groove (e.g. that is the case since the recess is formed by 20 and 29). Regarding claim 4: Wherein the housing unit (e.g. 10) has at least one surface section (e.g. end surfaces of 20) for guiding the support element (e.g. 18 and/or 19) during insertion into the housing unit (e.g. figures). Regarding claim 5: Wherein the support element (e.g. 18 and/or 19) is deformable for insertion into the housing unit (figure 5). Regarding claim 6: Wherein the support element has an annular shape at least in sections (e.g. see sections formed as 18 and 19). Regarding claim 7: Wherein the support element is formed in a disc-like manner (e.g. see figure 1). Regarding claim 8: Wherein the support element (e.g. element having 18 and 19) abuts at least in sections against an outer radial edge (e.g. edge of 29) of the housing unit. Regarding claim 10: Wherein the support element has a direct contact with the intermediate element at least during insertion into the housing unit (e.g. that is the case since the support element and the intermediate are next to each other). Regarding claim 11: Wherein the elastic element (e.g. 27) presses the intermediate element in the direction of the support element (e.g. see figure and 27). Regarding claim 12: Wherein the intermediate element (e.g. 21) is movably supported relative to the support element (e.g. that is the case since the intermediate element is pushed by spring 25 inwardly relative to the support element 19). Regarding claim 13: Wherein a mechanical seal having a mechanical sealing device of claim 1. Regarding claim 14: Method for mounting a mechanical sealing device, having a housing unit (see rejection of claims above) and an elastic element (e.g. see rejection of claims above), which is inserted into the housing unit (e.g. see rejection of claims above) and is pretensioned in the housing unit (e.g. see rejection of claims above and entire document of Vedovell) by means of a support element (see rejection of claims above). Claim(s) 1-8 and 10-14 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Dahlheimer (US. 20070108705A1). Dahlheimer discloses a mechanical sealing device (figures 3-4) having an elastic element (e.g. 48) and a housing unit (e.g. 20), further comprising a support element (e.g. 50) for pretensioning the elastic element in the housing unit. Wherein the mechanical sealing device further comprising an intermediate element (e.g. 42c) for transmitting force to the elastic element, which intermediate element is arranged between the elastic element and the support element (e.g. see figures). Regarding claim 2: Wherein the housing unit has a recess (e.g. recess having 50 and marked by dotted lines and solid lines) for accommodating the support element. Regarding claim 3: Wherein the recess (e.g. the recess) is formed at least in sections as an annular groove (e.g. that is the case as figures show by dotted lines for sections and solid lines for other sections). Regarding claim 4: Wherein the housing unit (e.g. 20) has at least one surface section (e.g. inner surface of 20 adjacent to 50) for guiding the support element (e.g. 50) during insertion into the housing unit (e.g. figures). Regarding claim 5: Wherein the support element (e.g. 50) is deformable for insertion into the housing unit (figures 3-4). Regarding claim 6: Wherein the support element has an annular shape at least in sections (e.g. see sections of 50). Regarding claim 7: Wherein the support element is formed in a disc-like manner (e.g. see figures 3-4). Regarding claim 8: Wherein the support element (e.g. figures 3-4) abuts at least in sections against an outer radial edge (e.g. edge of the housing unit contacted by 50) of the housing unit. Regarding claim 10: Wherein the support element has a direct contact with the intermediate element at least during insertion into the housing unit (e.g. that is the case since the support element and the intermediate are next to each other). Regarding claim 11: Wherein the elastic element (e.g. 42c) presses the intermediate element in the direction of the support element (e.g. see figures 3-4). Regarding claim 12: Wherein the intermediate element (e.g. 42c) is movably supported relative to the support element (e.g. that is the case as shown in figures 3-4). Regarding claim 13: Wherein a mechanical seal having a mechanical sealing device of claim 1. Regarding claim 14: Method for mounting a mechanical sealing device, having a housing unit (see rejection of claims above) and an elastic element (e.g. see rejection of claims above), which is inserted into the housing unit (e.g. see rejection of claims above) and is pretensioned in the housing unit (e.g. see rejection of claims above and entire document of Dahlheimer) by means of a support element (see rejection of claims above). 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. The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Ryan US20180017166 teaches all the claims limitations see 102, 120a/120b, 104, support ring 108 in groove of housing 102, Takenaka teaches all the limitation of claims see 13, 14, 15 and support ring above 10 that contacts 15 when assembled, Volden teaches all the limitations see 50, 54, 56 and support element adjacent to 58, Marsi teaches all the limitations see 10, 76, 82 and/or 58 and support element 70 and Borrino teaches all the limitations see 140, 146, 150, 162 and 161. Also see references on form 892. Any inquiry concerning this communication or earlier communications from the examiner should be directed to VISHAL A PATEL whose telephone number is (571)272-7060. The examiner can normally be reached 7:00 am to 4:00pm. 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, Christine Mills can be reached at 571-272-8322. 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. /VISHAL A PATEL/Primary Examiner, Art Unit 3675
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Prosecution Timeline

Oct 04, 2024
Application Filed
Oct 17, 2025
Non-Final Rejection — §102
Jan 21, 2026
Response Filed
Feb 24, 2026
Final Rejection — §102 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12601404
Internally clamping rectangular seal
2y 5m to grant Granted Apr 14, 2026
Patent 12590634
Piston Seal Ring Bypass
2y 5m to grant Granted Mar 31, 2026
Patent 12584556
SLIDING MEMBER
2y 5m to grant Granted Mar 24, 2026
Patent 12569962
HIGH PRESSURE LIQUID-JET SEAL ASSEMBLY CARRIAGE
2y 5m to grant Granted Mar 10, 2026
Patent 12560239
SLIDING COMPONENTS
2y 5m to grant Granted Feb 24, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
59%
Grant Probability
81%
With Interview (+21.7%)
3y 1m
Median Time to Grant
Moderate
PTA Risk
Based on 820 resolved cases by this examiner. Grant probability derived from career allow rate.

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