Prosecution Insights
Last updated: July 23, 2026
Application No. 19/066,133

Isolation of Ammonia from Wastewater with Struvite

Final Rejection §112
Filed
Feb 27, 2025
Priority
Feb 29, 2024 — provisional 63/559,870
Examiner
KURTZ, BENJAMIN M
Art Unit
1779
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Perseverance Water Guardian LLC
OA Round
2 (Final)
57%
Grant Probability
Moderate
3-4
OA Rounds
1y 9m
Est. Remaining
74%
With Interview

Examiner Intelligence

Grants 57% of resolved cases
57%
Career Allowance Rate
634 granted / 1118 resolved
-8.3% vs TC avg
Strong +17% interview lift
Without
With
+17.3%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
35 currently pending
Career history
1166
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
85.3%
+45.3% vs TC avg
§102
6.0%
-34.0% vs TC avg
§112
3.9%
-36.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1118 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 Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 1 and 3-10 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. The term “about” in claim 1 is a relative term which renders the claim indefinite. The term “about” is not defined by the claim, the specification does not provide a standard for ascertaining the requisite degree, and one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Claim 1, line 4 recites the L/N ration being about 4 to about 6. It is unclear how much less or more than 6 would be considered “about” 4 or 6. Similarly, line 7 recites the pH range being about greater than 9. It is unclear to what degree the pH can differ from greater than 9 and still be considered “about greater than 9, for instance is a pH of 9 considered “about” more than 9? Claims 3, 4 and 9 also recite ranges of temperatures and pH with the term “about” and re rejected for the same reasons as claim 1 above. Claim 1 recite the column having an L/N ration of about 4 to about 6. It is unclear what an L/N ration is. It appears to be a typo and applicant meant to recite an “L/D ratio” and such is assumed for purposes of examination. Claim 1 recites the limitation "the MP/MAP-packed column". There is insufficient antecedent basis for this limitation in the claim. For examination purposes the claim is assumed to recite, “the column”. Claim 3 recites the limitation "the external heating source". There is insufficient antecedent basis for this limitation in the claim. Claim 7 recites the limitation "the MP/MAP column". There is insufficient antecedent basis for this limitation in the claim. For examination purposes the claim is assumed to recite, “the column”. The term “about” in claim 10 is a relative term which renders the claim indefinite. The term “about” is not defined by the claim, the specification does not provide a standard for ascertaining the requisite degree, and one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. Claim 10, line 4 recites the L/N ration being about 4 to about 6. It is unclear how much less or more than 6 would be considered “about” 4 or 6. Similarly, line 7 recites the pH range being about greater than 9. It is unclear to what degree the pH can differ from greater than 9 and still be considered “about greater than 9, for instance is a pH of 9 considered “about” more than 9? Claim 10 recite the column having an L/N ration of about 4 to about 6. It is unclear what an L/N ration is. It appears to be a typo and applicant meant to recite an “L/D ratio” and such is assumed for purposes of examination. Claim 10 recites the limitation "the MP/MAP-packed column". There is insufficient antecedent basis for this limitation in the claim. For examination purposes the claim is assumed to recite, “the column”. The additional claims are rejected as depending from claim 1. Response to Arguments Applicant's arguments filed 6/2/26 have been fully considered but they are not persuasive. In the response filed by applicant, they indicated that the claims had been amended to address the various 112(b) rejections. However, no amendments were made to the claims to address the 112(b) rejections and therefore the 112(b) rejections still apply to the claims. The amendments to the specification and to the drawings have overcome the previous objections to the drawings. Allowable Subject Matter Claims 1 and 10 are allowable as they incorporate previously indicated allowable subject matter from claims 2 and 8, respectively. The additional claims are allowable as depending from claim 1. Conclusion THIS ACTION IS MADE FINAL. 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 at 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 1779
Read full office action

Prosecution Timeline

Feb 27, 2025
Application Filed
Mar 02, 2026
Non-Final Rejection mailed — §112
Jun 02, 2026
Response Filed
Jun 17, 2026
Final Rejection mailed — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12678718
FILTER ELEMENT WITH BIPLANAR O-RING
4y 4m to grant Granted Jul 14, 2026
Patent 12678721
LIQUID FILTER AND FILTER ELEMENT
3y 1m to grant Granted Jul 14, 2026
Patent 12649671
SYSTEM FOR CAPTURING AND RECYCLING WASHING COMPONENTS
3y 11m to grant Granted Jun 09, 2026
Patent 12649982
HIGH TEMPERATURE TREATED MEDIA
2y 8m to grant Granted Jun 09, 2026
Patent 12643061
FILTER ASSEMBLY WITH AUTHENTICATING FILTER ELEMENT COUPLING AND REPLACEABLE DROP-IN TWIST LOCKING FILTER ELEMENT THEREFOR
6y 7m to grant Granted Jun 02, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

Strategy Recommendation AI-generated — please review before filing

Get a prosecution strategy drawn from examiner precedents, rejection analysis, and claim mapping.
Typically takes 5-10 seconds — AI-generated, attorney review required before filing

Prosecution Projections

3-4
Expected OA Rounds
57%
Grant Probability
74%
With Interview (+17.3%)
3y 1m (~1y 9m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1118 resolved cases by this examiner. Grant probability derived from career allowance rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month