Prosecution Insights
Last updated: April 19, 2026
Application No. 18/259,936

METHOD FOR PREPARING ULTRA-FINE AND UNIFORM ACRYLAMIDE-BASED POLYMER HYDROGEL FILAMENT AND USE THEREOF

Non-Final OA §101§112
Filed
Jun 29, 2023
Examiner
HUHN, RICHARD A
Art Unit
1764
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Beijing Taijieweiye Technology Co. Ltd.
OA Round
1 (Non-Final)
66%
Grant Probability
Favorable
1-2
OA Rounds
2y 11m
To Grant
72%
With Interview

Examiner Intelligence

Grants 66% — above average
66%
Career Allow Rate
585 granted / 882 resolved
+1.3% vs TC avg
Moderate +6% lift
Without
With
+6.0%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
36 currently pending
Career history
918
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
37.2%
-2.8% vs TC avg
§102
22.3%
-17.7% vs TC avg
§112
25.3%
-14.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 882 resolved cases

Office Action

§101 §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 U.S.C. § 112(b) 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 1-10 are rejected under 35 U.S.C. § 112(b) as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor regards as the invention. Independent claim 1 recites a filament that is “ultra-fine” and “uniform”. The terms “ultra-fine” and “uniform” are not defined in the claims or in the specification. The terms “ultra-fine” and “uniform” are relative terms because they require a comparison to another filament having a different degree of fineness or a different degree of variability. However, the claims and specification do not provide such a point of comparison by which to judge the scope of the terms. The terms “ultra-fine” and “uniform” are subjective because they require one to exercise judgment with respect to whether any particular shape or size of a filament is “ultra-fine” or else more fine or less fine than “ultra-fine”; and whether any particular degree of variability of the filament falls within the scope of “uniform” or else is more variability than “uniform”. The specification does not contain a disclosure of an objective standard by which to determine whether or not any particular degree of fineness or degree of variability of a filament is sufficient or necessary to be considered “ultra-fine” and “uniform”. The specification also does not explain which characteristics, such as the diameter, aspect ratio, surface roughness, or other physical qualities, are considered in the assessment of the ‘uniformity’ of a filament. Absent any controlling definition or objective standard by which to judge the scope of the terms, different persons may reach different conclusions as to the scope of “ultra-fine” and “uniform” filaments. See MPEP 2175.05(b)(IV). Because one of ordinary skill in the art would need to exercise subjective judgment to make such a determination, the claim as read in light of the specification does not set forth the scope of the claimed invention with reasonable clarity. Claims 2-10 are ultimately dependent upon independent claim 1, and claim 10 also recites the terms “ultra-fine” and “uniform”; and they are indefinite for the same reasons. Independent claim 1 recites a step of cutting tubes into a plurality of “short” tubes. The term “short” is not defined in the claims or in the specification. The term “short” is a relative term because it requires a comparison to another tube having a different, longer length. However, the claims and specification do not provide such a point of comparison by which to judge the scope of the term. The term “short” is subjective because they require one to exercise judgment with respect to whether any particular length of a tube is “short” or else longer than “short”. The specification does not contain a disclosure of an objective standard by which to determine whether or not any particular length of a tube is sufficient or necessary to be considered “short”. Absent any controlling definition or objective standard by which to judge the scope of the terms, different persons may reach different conclusions as to the scope of “short” tubes. See MPEP 2175.05(b)(IV). Because one of ordinary skill in the art would need to exercise subjective judgment to make such a determination, the claim as read in light of the specification does not set forth the scope of the claimed invention with reasonable clarity. Claims 2-10 are ultimately dependent upon independent claim 1, and they are indefinite for the same reasons. Independent claim 1 recites a step of “naturally” drying a filament. The claims and the specification do not explain the manner in which the drying is a result of nature or what conditions constitute ‘natural’ drying. In the description of the process illustrated in Fig. 1, the specification states the following: “Two ends of the expanded filament of the acrylic acid-acrylamide copolymer or the expanded filament of the acrylamide homopolymer obtained in step 105 are fixed so that the expanded filament is naturally dried at room temperature” (Spec. p. 9, ¶ [0050]). This disclosure is not a definition of the term “naturally”, and thus the claimed drying step is not necessarily at room temperature. The examiner finds no further disclosure regarding the conditions that may constitute ‘natural’ drying. Claims 2-10 are ultimately dependent upon independent claim 1, and they are indefinite for the same reasons. Claim Rejections – 35 U.S.C. §§ 101, 112 The following is a quotation of 35 U.S.C. § 101: Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title. 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. Claim 10 is rejected under 35 U.S.C. § 101 as being drawn to a nonstatutory subject matter and under 35 U.S.C. § 112(b) as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor regards as the invention. Claim 10 is drawn to “using” a filament, and “using” is not one of the four categories of patent eligible subject matter. The claim thereby fails to comply with 35 U.S.C. § 101. The claim also does not set forth any particular steps of a method of performing the recited “using”, and therefore the claim does not inform one skilled in the art about the scope of the recited “using” with reasonable clarity. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to RICHARD A. HUHN whose telephone number is (571)270-7345. The examiner can normally be reached Monday through Friday, 9 AM to 6 PM EST. 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, Arrie (Lanee) Reuther can be reached at (571) 270-7026. 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. /RICHARD A. HUHN/Primary Examiner, Art Unit 1764
Read full office action

Prosecution Timeline

Jun 29, 2023
Application Filed
Jan 14, 2026
Non-Final Rejection — §101, §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
66%
Grant Probability
72%
With Interview (+6.0%)
2y 11m
Median Time to Grant
Low
PTA Risk
Based on 882 resolved cases by this examiner. Grant probability derived from career allow rate.

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