Prosecution Insights
Last updated: July 17, 2026
Application No. 18/463,309

Preparation Method of High-Absorptivity Chitosan/Bamboo Activated Carbon Composite Aerogel

Non-Final OA §112
Filed
Sep 08, 2023
Priority
Oct 24, 2022 — CN 202211304699.1 +1 more
Examiner
PREGLER, SHARON
Art Unit
1732
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Suichang Wenzhao Bamboo Charcoal Co. Ltd.
OA Round
1 (Non-Final)
78%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
694 granted / 887 resolved
+13.2% vs TC avg
Strong +21% interview lift
Without
With
+20.8%
Interview Lift
resolved cases with interview
Typical timeline
2y 6m
Avg Prosecution
31 currently pending
Career history
916
Total Applications
across all art units

Statute-Specific Performance

§101
1.3%
-38.7% vs TC avg
§103
75.0%
+35.0% vs TC avg
§102
5.5%
-34.5% vs TC avg
§112
4.3%
-35.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 887 resolved cases

Office Action

§112
DETAILED ACTION Specification The disclosure is objected to because of the following informalities: In paragraph [0014] of the instant specification, the phrase “chemical vapor disposition” should be “chemical vapor deposition” The recitation of the unit “rap/min” throughout the specification ([0015], [0016], [0018] and examples) appears to be rotational speed (revolutions per minute) but is not a standard unit designation. Revolutions per minute should be indicated as “rpm” or “r/min.” Appropriate correction is required. Claim Objections The following claims are objected to because informalities: Claim 1: In step (3) “and keeping stirring” should be “and continue stirring” Claim 13: “100-1000 meshes” should be “100-1000 mesh.” Claims 13, 14 and 16: the unit “rap/min” is an incorrect unit for revolutions per minute. It should be “rpm” or “r/min.” Appropriate correction is required. 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 11-20 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. Claim 11: In part (b) the recitation “the harmful gas to flow forward in a single direction” is indefinite because there is no defined reference direction. It is taken that the gas flows sequentially from the flow meter to the gas-generating bottle then to the buffer bottle. In part (d) the recitation “connecting a particle to a back of the after-filtering bottle” is indefinite because “back” lacks an objective boundary. In step (1) the phrase “chitosan/bamboo” can be interpreted as chitosan AND/OR bamboo. It should be clear that “chitosan/bamboo” is chitosan and bamboo. The Examiner recommends amending to “chitosan-bamboo” In step (3) “the recitation “a solution obtained in step (2)” lacks antecedent basis. From the spec, step (2) starts with the chitosan/bamboo activated carbon suspension from step (1), adds glacial acetic acid, then stirs until the chitosan dissolves then is carried to step (3). Thus, “a solution obtained in step (2)” should be “the solution obtained in step (2).” In step (4) the recitation “freeze the liquid in shape, and then freeze-drying the liquid with a vacuum freeze dryer” is unclear. Freezing the liquid in shape indicates a solid is formed thus it unclear what liquid will be taken to the vacuum freeze dryer. Step (4) is taken to mean “freezing the liquid obtained in step (3) and subsequently freeze-drying the frozen liquid with a vacuum freeze dryer.” Claim 18: The step (5) indicates an improper dependency on claim 11. Claim 12 introduces step (5) thus, claim 18 should depend on claim 12 not 11. Claim 18 recites further limitations to step (5) which was first introduced in claim 12. Claims 12-20 are rejected under 112 by virtue of their dependency on claim 11. Allowable Subject Matter Claims 11-20 would be allowable if rewritten or amended to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action. The closest prior art is Huo et al. CN 112742355 who teaches a chitosan-based composite gas gel adsorption material and preparation method comprising chemical crosslinking, material composite and freeze-drying methods. The method of making the filter comprises: 1) dissolving the chitosan in acetic acid solution; fully stirring and filtering to obtain chitosan solution; adding material with multi-active adsorption group; fully stirring and then filtering again; adding reinforced material in the obtained solution; mixing uniformly to obtain the mixed solution; (2) gradually dropping the mixed solution into the alkali solution at a flow rate of 0.5 to 3 ml/min and a height of 3 to 15cm, obtaining chitosan composite hydrogel microsphere, stirring for 6 to 12h to make the chitosan composite hydrogel micro-bead fully solidify, washing; (3) adding the chitosan composite hydrogel microsphere after curing into the cross-linking agent water solution, 25 to 50°C constant temperature crosslinking reaction for 1 to 4h, washing to obtain cross-linked chitosan hydrogel microsphere; (4) putting the cross-linked chitosan hydrogel microsphere in liquid nitrogen to freeze for 1-5min, freezing and drying to obtain chitosan-based composite aerogel micro-bead heavy metal ion adsorption material. (See Huo top of page 3). However, the prior art does not teach or suggest the claimed invention as a whole including forming a chitosan-bamboo activated carbon suspension composite aerogel as the filter used in the recited adsorbing system having the gas generating bottle, buffer bottle, after-filtering bottle and particle counter to evaluate adsorption efficiency. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to SHARON PREGLER whose telephone number is (571)270-5051. The examiner can normally be reached Monday - Friday 9am - 5pm. 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, In Suk Bullock can be reached at (571) 272-5954. 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. /SHARON PREGLER/ Primary Examiner, Art Unit 1772
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Prosecution Timeline

Sep 08, 2023
Application Filed
Jun 26, 2026
Non-Final Rejection mailed — §112 (current)

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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
78%
Grant Probability
99%
With Interview (+20.8%)
2y 6m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 887 resolved cases by this examiner. Grant probability derived from career allowance rate.

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