Prosecution Insights
Last updated: October 02, 2026
Application No. 17/862,825

METHODS AND COMPOSITIONS RELATING TO HOT-START, ONE-STEP, REVERSE TRANSCRIPTION-COUPLED PCR

Final Rejection §101§103
Filed
Jul 12, 2022
Priority
Jul 12, 2021 — provisional 63/220,631
Examiner
CHANDRA, GYAN
Art Unit
1674
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Wayne State University
OA Round
2 (Final)
71%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 71% — above average
71%
Career Allowance Rate
720 granted / 1010 resolved
+11.3% vs TC avg
Strong +28% interview lift
Without
With
+27.5%
Interview Lift
resolved cases with interview
Typical timeline
2y 6m
Avg Prosecution
34 currently pending
Career history
1036
Total Applications
across all art units

Statute-Specific Performance

§101
4.0%
-36.0% vs TC avg
§103
31.8%
-8.2% vs TC avg
§102
14.8%
-25.2% vs TC avg
§112
30.3%
-9.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1010 resolved cases

Office Action

§101 §103
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 . Applicant’s response filed on 6/25/2026 is acknowledged and fully considered. Status of Application, Amendments, And/Or Claims The amendments of claims 1, 4 and 12 have been made of record. Claims 1-16 are pending. Claims 15-16 remain withdrawn for the reasons of record at pg. 2 of the office action of 1/14/2026. Claims 1-14 are under consideration. Response to Arguments Claim Rejections - 35 USC § 101-maintained 35 U.S.C. 101 reads as follows: 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. Claims 1-14 remain rejected under 35 U.S.C. 101 because the claimed invention is directed to non-statutory subject matter for the reasons of record at pg. 3-7 of the office action of 1/14/2026 and as discussed below. Applicants argue that the office asserts that the thermostable polymerase of SEQ ID NO:1 exists in nature on the basis of search result but the sequence alignment does not include SEQ ID NO: 1 in the sequence alignment. Applicants’ arguments have been fully considered and they are not persuasive because sequence results are presented in PE2E database. They suggest that thermostable polymerase is present in nature. The sequence search results include sequences wherein amino acid 435 of SEQ ID NO: 1 is leucine. Some of the examples are shown below (it is noted that the alignment of the sequence can be seen in the PE2E search results of 7/31/2026, the sequence alignment is with the instantly claimed SEQ ID NO: 1 with leucine at position 453): RESULT 1 AAR13143 (NOTE: this sequence has 50 duplicates in the database searched. See complete list at the end of this report) ID AAR13143 standard; protein; 834 AA. XX AC AAR13143; XX DT 15-JUN-2007 (revised) DT 03-OCT-1991 (first entry) XX DE T. thermophilus DNA polymerase I. XX KW Thermus thermophilus; thermostable; Tth; amplification; PCR; polymerase; KW BOND_PC; DNA polymerase I; DNA polymerase I [Thermus thermophilus HB8]; KW DNA polymerase I, thermostable (Tth polymerase 1).; KW DNA polymerase I, thermostable. XX OS Thermus thermophilus. XX CC PN WO9109950-A. XX CC PD 11-JUL-1991. XX CC PF 21-DEC-1990; 90WO-US007639. XX PR 22-DEC-1989; 89US-00455967. PR 21-DEC-1990; 90WO-US007639. XX CC PA (CETU ) CETUS CORP. XX CC PI Gelfand DH, Lawyer FC, Stoffel S; XX DR WPI; 1991-222902/30. DR N-PSDB; AAQ12748. DR PC:NCBI; gi55772436. DR PC:SWISSPROT; P52028. XX CC PT Thermus thermophilus DNA polymerase I - used for nucleic acid CC PT amplification DNA sequencing, nick-translation and reverse transcription. XX CC PS Disclosure; Page 7-13; 64pp; English. XX CC The Tth enzyme does not become irreversibly denatured to relatively short CC exposures of temps. of 90-100 degrees C and has optimum activity at 50-90 CC degrees C. The enzyme can be used to design peptides for use as CC immunogens to prepare antibodies that can be used to identify and purify CC a thermostable polymerase. See also AAQ12748-51 CC CC Revised record issued on 15-JUN-2007 : Enhanced with precomputed CC information from BOND. XX SQ Sequence 834 AA; Query Match 100.0%; Score 4266; Length 834; Best Local Similarity 100.0%; Matches 834; Conservative 0; Mismatches 0; Indels 0; Gaps 0; PNG media_image1.png 831 688 media_image1.png Greyscale PNG media_image2.png 463 697 media_image2.png Greyscale Claim Rejections - 35 USC § 103-maintained The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. Claim(s) 1-14 remain rejected under 35 U.S.C. 103 as being unpatentable over Gelfand et al. (AU 7244491 A) in view of Zou et al. (US 20050064426) and Asakura et al. (J. Ferment. Bioeng. 76:265-269(1993)) for the reasons of record at pg. 7-11 of the office action of 1/14/2026 and as discussed below. Applicants argue that applicant amends claim 1 to emphasize aspects of composition which includes a recombinant thermostable DNA polymerase comprising SEQ ID NO:1 or a variant thereof having at least 99% sequence identity to SEQ ID NO: 1, with the proviso that amino acid 453 of SEQ ID NO:1 is leucine. Applicants’ arguments have been fully considered but they are not persuasive because the prior art (Gelfand et al.) is 100% identical to the instantly claimed amino acid sequence of SEQ ID NO: 1 and it comprises amino acid 453 as leucine (see as discussed above and sequence alignment set forth above). Therefore, the rejection is maintained. Conclusion No claim is allowed. 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 GYAN CHANDRA whose telephone number is (571)272-2922. The examiner can normally be reached Mon-Friday 8:30AM-5:00P. 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, Vanessa Ford can be reached at 571-272-0857. 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. /GYAN CHANDRA/Primary Examiner, Art Unit 1674
Read full office action

Prosecution Timeline

Jul 12, 2022
Application Filed
Nov 14, 2025
Non-Final Rejection (signed) — §101, §103
Jan 14, 2026
Non-Final Rejection mailed — §101, §103
Jun 25, 2026
Response Filed
Aug 11, 2026
Final Rejection mailed — §101, §103 (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

3-4
Expected OA Rounds
71%
Grant Probability
99%
With Interview (+27.5%)
2y 6m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1010 resolved cases by this examiner. Grant probability derived from career allowance rate.

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