Prosecution Insights
Last updated: April 19, 2026
Application No. 17/331,267

WATER FILTER CARTRIDGE AND HEAD HAVING KEYED ENGAGEMENT

Final Rejection §112
Filed
May 26, 2021
Examiner
KURTZ, BENJAMIN M
Art Unit
1779
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Culligan International Company
OA Round
8 (Final)
57%
Grant Probability
Moderate
9-10
OA Rounds
3y 1m
To Grant
74%
With Interview

Examiner Intelligence

Grants 57% of resolved cases
57%
Career Allow Rate
627 granted / 1104 resolved
-8.2% vs TC avg
Strong +17% interview lift
Without
With
+17.4%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
50 currently pending
Career history
1154
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
43.0%
+3.0% vs TC avg
§102
23.9%
-16.1% vs TC avg
§112
25.1%
-14.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1104 resolved cases

Office Action

§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 . Claim Objections Claim 8 is objected to because of the following informalities: Claim 8, line 31 appears to have a typo and should read, “said check valve is in the closed position.” Appropriate correction is required. Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claims 8, 10-11, 18, 24 and 26-28 are rejected under 35 U.S.C. 112(a) or 35 U.S.C. 112 (pre-AIA ), first paragraph, as failing to comply with the written description requirement. The claim(s) contains subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, or for applications subject to pre-AIA 35 U.S.C. 112, the inventor(s), at the time the application was filed, had possession of the claimed invention. Claim 8 recites the inlet and outlet ports each include four separated inwardly projecting protrusions. Applicant states that figure 2 shows three inwardly projecting protrusions and that figure 2 is fragmentary vertical cross section of the filter cartridge. Applicant then states that it would be understood by a person of ordinary skill in the art that each port will have four inwardly projecting protrusions. The figures only show three protrusions. The written description is silent as to the number of protrusion nor does the written description provide any discussion of or provide any description of the protrusions. While one of ordinary skill in the art might surmise that there are four protrusions, the specification does not expressly teach this. Therefore, the specification as originally filed does not provide sufficient support for the recitation of four protrusions and the recitation in the claims is new matter. The additional claims are rejected as depending from claim 8. Allowable Subject Matter Claims 1, 3-4, 7-8, 10-14, 17-19, 21, 23-24 and 26-28 are allowed. The following is an examiner’s statement of reasons for allowance: Claim 1 is directed to a water filter assembly comprising a filter head and claim 12 is directed to a filter head. The closest prior art of record, indicated in the previous office action of 4/7/25, teaches as obvious the water filter assembly and filter head but do not teach the flat upper surface extending directly above the bypass conduit nor would it have been obvious to modify the prior art in combination with the other claimed elements to arrive at the claimed invention. Regarding claim 8, the closest prior art to Ye, Zhu, Kwon, Swain and Zhang teaches as obvious the filter cartridge of claim 8 but do not teach the inlet and outlet ports each include four separated inwardly projecting protrusions. Zhang teaches as obvious providing a check valve in each of the inlet and outlet ports being biased to a closed position by a spring but does not teach the check valve contacts the at least one internal sealing member when the check valve is in the closed position nor would it have been obvious to one of ordinary skill in the art to modify the prior art to arrive at the claimed invention. The additional claims are allowable as depending from claim 1, 8 or 12. Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee. Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.” 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 BENJAMIN M KURTZ whose telephone number is (571)272-8211. The examiner can normally be reached Monday-Friday 8:30-5. 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, Bobby Ramdhanie can be reached on 571-270-3240. 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. /BENJAMIN M KURTZ/Primary Examiner, Art Unit 1778
Read full office action

Prosecution Timeline

May 26, 2021
Application Filed
Sep 13, 2023
Non-Final Rejection — §112
Dec 01, 2023
Response Filed
Jan 12, 2024
Final Rejection — §112
Mar 14, 2024
Response after Non-Final Action
Mar 22, 2024
Response after Non-Final Action
Mar 22, 2024
Examiner Interview (Telephonic)
Mar 28, 2024
Request for Continued Examination
Apr 01, 2024
Response after Non-Final Action
Aug 20, 2024
Non-Final Rejection — §112
Nov 25, 2024
Response Filed
Jan 07, 2025
Final Rejection — §112
Mar 04, 2025
Response after Non-Final Action
Mar 21, 2025
Request for Continued Examination
Mar 24, 2025
Response after Non-Final Action
Apr 02, 2025
Non-Final Rejection — §112
May 12, 2025
Applicant Interview (Telephonic)
May 12, 2025
Examiner Interview Summary
Jul 02, 2025
Response Filed
Jul 02, 2025
Response after Non-Final Action
Jul 11, 2025
Final Rejection — §112
Sep 05, 2025
Applicant Interview (Telephonic)
Sep 05, 2025
Examiner Interview Summary
Nov 12, 2025
Request for Continued Examination
Nov 13, 2025
Response after Non-Final Action
Nov 25, 2025
Non-Final Rejection — §112
Feb 27, 2026
Response Filed
Mar 26, 2026
Final Rejection — §112
Mar 30, 2026
Examiner Interview Summary
Mar 30, 2026
Applicant Interview (Telephonic)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12601718
METHOD FOR PRETREATING RANITIDINE HYDROCHLORIDE SAMPLE
2y 5m to grant Granted Apr 14, 2026
Patent 12600646
WATER PURIFYING APPARATUS AND REFRIGERATOR INCLUDING THE SAME
2y 5m to grant Granted Apr 14, 2026
Patent 12589441
LIQUID CIRCULATION SYSTEM AND BORING SYSTEM INCLUDING THE SAME
2y 5m to grant Granted Mar 31, 2026
Patent 12589339
OIL FILTER CARTRIDGE
2y 5m to grant Granted Mar 31, 2026
Patent 12576350
FILTERING GROUP INCLUDING A SPHERICAL VALVE
2y 5m to grant Granted Mar 17, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

9-10
Expected OA Rounds
57%
Grant Probability
74%
With Interview (+17.4%)
3y 1m
Median Time to Grant
High
PTA Risk
Based on 1104 resolved cases by this examiner. Grant probability derived from career allow rate.

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