Prosecution Insights
Last updated: April 19, 2026
Application No. 18/252,445

LIGNIN COMPOSITION AND USE THEREOF

Non-Final OA §112
Filed
May 10, 2023
Examiner
SALAMON, PETER A
Art Unit
1759
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Idemitsu Kosan Co. Ltd.
OA Round
1 (Non-Final)
86%
Grant Probability
Favorable
1-2
OA Rounds
2y 6m
To Grant
92%
With Interview

Examiner Intelligence

Grants 86% — above average
86%
Career Allow Rate
702 granted / 816 resolved
+21.0% vs TC avg
Moderate +6% lift
Without
With
+5.9%
Interview Lift
resolved cases with interview
Typical timeline
2y 6m
Avg Prosecution
16 currently pending
Career history
832
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
43.2%
+3.2% vs TC avg
§102
24.8%
-15.2% vs TC avg
§112
17.7%
-22.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 816 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 . In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. Election/Restrictions Applicant's election with traverse of Group I, claims 1 - 7 in the reply filed on 1/26/26 is acknowledged. The traversal is on the ground(s) that there is no serious burden of examining all the claims. This is not found persuasive because there is both a search and examination burden for each group. The requirement is still deemed proper and is therefore made FINAL. 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. Claim 1 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. It is unclear what material the structure of formula (1) represents. Carbon is known to have a valence of 4 and as such forms 4 covalent bonds. The central carbon atom in the structure has only 3 covalent bonds. Additionally, the carbon atoms comprising the phenyl rings to which the central section is to be bonded to already comprise 4 covalent bonds. It is unclear where the additional bonds will be formed. Claims 2 – 7 are rejected as being dependent on a rejected independent claim. Cited Art of Interest US 4647704 to Engels at al. teaches at Example 2 a method of hydrocracking lignin comprising phenol, lignin, hydrogen at a pressure of 100 atm and a temperature of 400C for 1 hour. JP 2020050815 A to Go, Yoshiyuki teaches at synthesis of resin material A comprising phenol, oxalic acid which is heated and combined with lignin to yield a modified lignin resin. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to PETER A. SALAMON whose telephone number is 571-270-3018. The examiner can normally be reached M-F: 9AM - 6PM. 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, Duane Smith can be reached at 571-272-1166. 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. PAS 3/5/26 /PETER A SALAMON/Primary Examiner, Art Unit 1759
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Prosecution Timeline

May 10, 2023
Application Filed
Mar 05, 2026
Non-Final Rejection — §112 (current)

Precedent Cases

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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
86%
Grant Probability
92%
With Interview (+5.9%)
2y 6m
Median Time to Grant
Low
PTA Risk
Based on 816 resolved cases by this examiner. Grant probability derived from career allow rate.

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