Prosecution Insights
Last updated: April 19, 2026
Application No. 18/531,700

LAYERED MULTI-METAL-OXIDE-BASED MAGNETIC BIOCHAR AND PREPARATION METHOD AND USE THEREOF

Final Rejection §112
Filed
Dec 07, 2023
Examiner
HENDRICKSON, STUART L
Art Unit
1736
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Institute Of Environment And Sustainable Development In Agriculture Chinese Academy
OA Round
2 (Final)
72%
Grant Probability
Favorable
3-4
OA Rounds
3y 2m
To Grant
80%
With Interview

Examiner Intelligence

Grants 72% — above average
72%
Career Allow Rate
699 granted / 969 resolved
+7.1% vs TC avg
Moderate +8% lift
Without
With
+8.2%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
42 currently pending
Career history
1011
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
65.9%
+25.9% vs TC avg
§102
1.4%
-38.6% vs TC avg
§112
8.0%
-32.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 969 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 . The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Formal matter: The new filing receipt disagrees with the new Oath. 112 rejections: Claims 2, 4 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 ‘preferably’ sub-limitations in claims 2 and 4 are improper and unclear if they limit the claims. Allowable subject matter: Luo 20220126267 is noted as teaching carbonizing bamboo and sludge, then post-treating with a metal salt. Wang 20180016162 page 3 is noted as teaching mixing biomass with one or more iron and other salts to make a magnetic material. However, the prior art does not teach or suggest the claimed steps; especially the use of multiple salts in multiple steps and the pH adjustment therebetween as required by independent claim 1. Applicant's arguments filed 3/2/26 have been fully considered but they are not persuasive. Not all the errors were corrected. 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 STUART L HENDRICKSON whose telephone number is (571)272-1351. The examiner can normally be reached on Monday-Friday from 9 to 5. If attempts to reach the examiner by telephone are unsuccessful, the examiner's supervisor, Anthony Zimmer, can be reached on 571-270-3591. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. /STUART L HENDRICKSON/Primary Examiner, Art Unit 1736
Read full office action

Prosecution Timeline

Dec 07, 2023
Application Filed
Nov 25, 2025
Non-Final Rejection — §112
Mar 02, 2026
Response Filed
Mar 17, 2026
Final Rejection — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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2y 5m to grant Granted Apr 14, 2026
Patent 12600864
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2y 5m to grant Granted Apr 14, 2026
Patent 12576385
CARBON MOLECULAR SIEVE ADSORBENT MONOLITHS AND METHODS FOR MAKING THE SAME
2y 5m to grant Granted Mar 17, 2026
Patent 12577109
BORON-SULFUR-CODOPED POROUS CARBON MATERIAL AND PREPARATION METHOD AND USE THEREOF
2y 5m to grant Granted Mar 17, 2026
Patent 12577119
METHOD FOR FORMING INSOLUBLE SOLUTE ADDUCTS USING AN ACIDIC MEDIUM
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

3-4
Expected OA Rounds
72%
Grant Probability
80%
With Interview (+8.2%)
3y 2m
Median Time to Grant
Moderate
PTA Risk
Based on 969 resolved cases by this examiner. Grant probability derived from career allow rate.

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