Prosecution Insights
Last updated: September 17, 2026
Application No. 17/964,598

LEVENSHTEIN DISTANCE-BASED IRES SCREENING METHOD AND POLYNUCLEOTIDE SCREENED BASED ON SAME

Non-Final OA §101§112
Filed
Oct 12, 2022
Priority
Oct 12, 2021 — CN 202111185073.9 +1 more
Examiner
YOUNG, BRIAN ELLIS
Art Unit
1684
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Purecodon (Hong Kong) Biopharma Ltd.
OA Round
1 (Non-Final)
66%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
96%
With Interview

Examiner Intelligence

Grants 66% — above average
66%
Career Allowance Rate
23 granted / 35 resolved
+5.7% vs TC avg
Strong +30% interview lift
Without
With
+30.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 10m
Avg Prosecution
26 currently pending
Career history
65
Total Applications
across all art units

Statute-Specific Performance

§101
3.2%
-36.8% vs TC avg
§103
36.7%
-3.3% vs TC avg
§102
15.0%
-25.0% vs TC avg
§112
27.4%
-12.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 35 resolved cases

Office Action

§101 §112
Notice of Pre-AIA or AIA Status 1. The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Election/Restrictions 2. Applicant’s election without traverse of Group I, claims 1-5, in the reply filed on 06 May 2026 is acknowledged. The election of SEQ ID NO: 496 is not relevant at this time as no SEQ IDs are present in the claims of elected Group I. Claim Rejections - 35 USC § 112 3. 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. 4. Claim 5 is 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 5 recites the limitation "…by using the to-be-predicted sequence determined to comprise the IRES…" in lines 3 and 4. It is noted that claim 1, upon which claim 5 depends, does not require that the to-be-predicted sequences comprise the IRES. Therefore the limitations of claim 5 are conditional limitations to claim 1 and only apply to embodiments wherein the to-be-predicted sequences were determined to comprise the IRES. Therefore, there is insufficient antecedent basis for this limitation in the claim. Claim Rejections - 35 USC § 101 5. 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. 6. Claims 1-5 are rejected under 35 U.S.C. 101 because the claimed invention is directed to an abstract idea without significantly more. Claim 1 recites the steps “selecting n sequences comprising an IRES…” (a mental process), “subjecting the sample sequences and to-be-predicted sequences to one-hot encoding…” (a mathematical algorithm), “calculating a Levenshtein distance…” (a mathematical algorithm), “calculating an average…” (a mathematical algorithm), and “determining, based on the average…” (a mental process). Claims 2 and 3 disclose further mental processes related to comparing the results of the method of claim 1 to prediction thresholds, and while claim 4 recites an “experimental verification” step there is no language in the claim to indicate or specify that this step is not also drawn to a judicial exception (i.e., experimental verification performed in silico would be a mathematical algorithm). This judicial exception is not integrated into a practical application because there are no specific limitations in claims 1-4 that are not related to the judicial exceptions. Claim 5 does not integrate the judicial exception into a practical application because it only recites limitations related to embodiments related to “…to-be-predicted sequences determined to comprise this IRES…”, however step (5) of claim 1 (from which claim 5 depends) does not require that the to-be-predicted sequences comprise an IRES at all. The claims do not include additional elements that are sufficient to amount to significantly more than the judicial exception because there are no required steps in addition to the judicial exceptions. The only claim that is not solely drawn to a judicial exception is claim 5, which does recite an experimental verification step that is not drawn to a judicial exception, however as discussed fully above and incorporated here claim 5 does not have proper antecedent basis in claim 1, only providing a conditional limitation depending on the “determining” process in step (5) of claim 1. Conclusion 7. The closest prior art in relation to the instant claims is found in Gritsenko et al (Sequence features of viral and human internal ribosome entry sites predictive of their activity, PLOS Computational Biology, 13(9): e1005734, published 18 September 2017), Wang et al (IRESpy: an XGBoost model for prediction of internal ribosome entry sites, BMC Bioinformatics, 20, 409, published 30 July 2019) and Berger et al (Levenshtein distance, sequence comparison and biological database search, IEEE Transactions on Information Theory, 67, 6 published 20 May 2021). Gritsenko and Wang teach existing models for IRES prediction based on sample sets comprised of experimental validated IRES structures (Gritsenko, Wang; abstracts). These references use structural data, kmer words (i.e., sequences of a particular length) and random forest models to predict IRES activity after having trained a model on known IRES sequences. Berger describes Levenshtein distance calculations and their use in similarity searches and alignments between nucleic acid sequences (abstract). Neither Wang nor Gritsenko directly compare known IRES sample sequences to a to-be-predicted sequence (rather, they train a model to predict IRES motifs from unknown sequences), nor do they use one-hot encoding to categorized the nucleic acid bases, nor do they use Levenshtein distance averages between sample IRESes and to-be-predicted sequences to determine the presence of IRES sequences. Berger teaches the use of Levenshtein distance to rapidly calculate sequence similarities, but specifically teaches that modern bioinformatics heuristics such as K-mer matching (as used by Gritsenko and Wang) have partially supplanted the direct use of Levenshtein distance alignments (pg. 3292 column 2 ¶ 2). 8. No claims are allowed. 9. Any inquiry concerning this communication or earlier communications from the examiner should be directed to BRIAN ELLIS YOUNG whose telephone number is (703)756-5397. The examiner can normally be reached M-T 0800 - 1630. 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, Heather Calamita can be reached at (571) 272-2876. 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. /BRIAN ELLIS YOUNG/Examiner, Art Unit 1684 /JULIET C SWITZER/Primary Examiner, Art Unit 1682
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Prosecution Timeline

Oct 12, 2022
Application Filed
Aug 11, 2026
Non-Final Rejection mailed — §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
96%
With Interview (+30.1%)
3y 10m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 35 resolved cases by this examiner. Grant probability derived from career allowance rate.

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