Prosecution Insights
Last updated: May 29, 2026
Application No. 18/498,019

INTEGRATED DEVICE AND METHOD FOR ENRICHMENT, PURIFICATION AND SEPARATION OF MICROPLASTICS IN SECONDARY EFFLUENT

Non-Final OA §112
Filed
Oct 30, 2023
Priority
Oct 31, 2022 — CN 202211349055.4
Examiner
MENON, KRISHNAN S
Art Unit
1777
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Xi’An University Of Architecture And Technology
OA Round
1 (Non-Final)
60%
Grant Probability
Moderate
1-2
OA Rounds
8m
Est. Remaining
72%
With Interview

Examiner Intelligence

Grants 60% of resolved cases
60%
Career Allowance Rate
890 granted / 1489 resolved
-5.2% vs TC avg
Moderate +12% lift
Without
With
+11.8%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
58 currently pending
Career history
1553
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
83.8%
+43.8% vs TC avg
§102
7.6%
-32.4% vs TC avg
§112
4.3%
-35.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1489 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 . Election/Restrictions Applicant’s election without traverse of claims 1-6 in the reply filed on 2/13/26 is acknowledged. 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. Claims 1-6 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 structure of the filtering unit in claim 1 is unclear. Claims recite mounting the marked screen meshes, then filtering the water, then mounting the fixed screen meshes to perform in-situ purification. The actual arrangement of the screens is confusing and unclear. This is because applicant’s fig. 1 shows the marked screens as removable in the assembly with the clamps 4, whereas the fixed meshes are fixed to the filter housing. Also, the relationship between fixed screens and marked screens is given in the specification as: PNG media_image1.png 45 217 media_image1.png Greyscale This equation results ion a negative number for M. Suggested correction: ratio of M/m = 2 to 3.75. Allowable Subject Matter Claims 1-6 are allowable when corrected for any 112(b) issues, without changing the scope of the subject matter claimed. Several references were found that taught the increasing mesh number screen stacks for this intended purpose, but none of these teach the elaborate in-situ purification scheme as claimed in claim 2 and incorporating the fixed meshes before the in-situ cleaning in claim 1, for the reason the examiner assumes as preventing the loss of microplastics collected during filtration by covering the marked screens with Larger mesh number (smaller opening) fixed screens. As example of a close prior art is: PNG media_image2.png 455 672 media_image2.png Greyscale Other prior arts found are listed in an 892. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to KRISHNAN S MENON whose telephone number is (571)272-1143. The examiner can normally be reached Flexible, but generally Monday-Friday: 8:00AM-4:30PM. 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, Prem C Singh can be reached at 571-272-6381. 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. /KRISHNAN S MENON/ Primary Examiner, Art Unit 1777
Read full office action

Prosecution Timeline

Oct 30, 2023
Application Filed
Mar 25, 2026
Non-Final Rejection mailed — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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METHOD FOR TREATING WASTEWATER FOR THE RECOVERY OF METALS CONTAINED THEREIN, AND APPARATUS FOR SUCH A METHOD
4y 0m to grant Granted May 26, 2026
Patent 12637364
WATER TREATMENT SYSTEM AND METHOD FOR USE WITH AN ENVIRONMENTAL CHAMBER OR AN INCUBATOR
2y 10m to grant Granted May 26, 2026
Patent 12637376
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2y 8m to grant Granted May 26, 2026
Patent 12631604
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3y 6m to grant Granted May 19, 2026
Patent 12616941
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4y 0m to grant Granted May 05, 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
60%
Grant Probability
72%
With Interview (+11.8%)
3y 3m (~8m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1489 resolved cases by this examiner. Grant probability derived from career allowance rate.

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