Prosecution Insights
Last updated: July 17, 2026
Application No. 17/782,194

MOLECULAR WEIGHT MARKER FOR ELECTROPHORESIS, NUCLEIC ACID FRACTIONATION METHOD AND NUCLEIC ACID SIZE ANALYSIS METHOD

Final Rejection §112
Filed
Jun 03, 2022
Priority
Dec 20, 2019 — nonprovisional of PCTJP2019050152
Examiner
QIAN, SHIZHI
Art Unit
1700
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Hitachi Ltd.
OA Round
4 (Final)
61%
Grant Probability
Moderate
5-6
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allowance Rate
175 granted / 286 resolved
-3.8% vs TC avg
Strong +49% interview lift
Without
With
+48.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
67 currently pending
Career history
352
Total Applications
across all art units

Statute-Specific Performance

§101
1.5%
-38.5% vs TC avg
§103
80.1%
+40.1% vs TC avg
§102
4.5%
-35.5% vs TC avg
§112
10.2%
-29.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 286 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 . Continued Examination Under 37 CFR 1.114 A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after final rejection. Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114. Applicant's submission filed on 8/12/2025 has been entered. Status of the Claims The amendment filed 8/12/2025 has been entered. Claims 6, 10, and 17 have been amended. Claims 1-17 are currently pending, and claims 6-10 and 16-17 are examined herein. Status of the Rejection Applicant’s amendments to the claims have overcome various rejections previously set forth in the Final Rejection filed 5/22/2025. All 35 U.S.C. § 103 rejections from the previous office action are withdrawn in view of the Applicant’s amendment. New claim objections and grounds of rejection under 35 U.S.C. § 112(a) and 112(b) are necessitated by the amendments as outlined below. Claim Objections Claims 6 and 16-17 are objected to because of the following informalities: In claim 6 lines 11-12, “no more than + 5 % when the concentration of an agarose gel is changed from 0.8 % w/v to 3 % w/v” should be amended to -- no more than +5% 0.8% w/v to 3% w/v In claim 6 line 15, “a nucleic-acid fragment of a target base length” should be amended to --a nucleic-acid fragment of the nucleic acid sample of a target base length--. In claim 6 line 17, “the nucleic acid” should be amended to --the nucleic acid sample--. In claim 6 line 23, “the portion[“ should be amended to --the portion In claim 16 line 3, “an electrophoresed sample” should be amended to --[[an]] the electrophoresed sample--. In claim 17 lines 3-4, “a nucleic acid fragment of the nucleic acid sample of a target base length” should be amended to --[[a]] the nucleic acid fragment of the nucleic acid sample of [[a]] the target base length--. Appropriate correction is required. Claim Rejections - 35 USC § 112 The following is a quotation of the first paragraph of 35 U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claims 6-10 and 16-17 are rejected under 35 U.S.C. 112(a) or 35 U.S.C. 112 (pre-AIA ), first paragraph, as failing to comply with the written description requirement. The claim(s) contains subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, or for applications subject to pre-AIA 35 U.S.C. 112, the inventor(s), at the time the application was filed, had possession of the claimed invention. Claim 6 recites “a molecular-weight marker […] that comprises a linear inorganic polyphosphate salt having 50 to 500 phosphate repeat units and a number-average molecular weight of 5 kDa to 50 kDa” in lines 4-8. While the molecular-weight marker comprising a linear polyphosphate salt is taught in the instant specification (“Examples of the homopolymer that can be used as the molecular weight marker for electrophoresis of the present embodiment include a polyphosphoric acid […] and salts or derivatives thereof,” para. [0030, 0035]), there is no mention in the specification of the number of phosphate repeat units or the molecular weight in kDa of a polyphosphate salt molecular-weight marker. Thus, this limitation is deemed to be new matter. Claim 6 further recites “exhibiting an electrophoretic mobility that varies by no more than + 5 % when the concentration of an agarose gel is changed from 0.8 % w/v to 3 % w/v” in lines 11-12. There is no mention in the instant specification regarding the change in electrophoretic mobility of a phosphate salt in an agarose gel with an adjusted concentration. Thus, this limitation is deemed to be new matter. Claim 6 further recites “determining a position in the lane of the electrophoresed sample that matches a predetermined position […] cutting out a portion of the lane that contains the molecular-weight marker at the predetermined position” in lines 19-22. There is no mention in the instant specification of a “predetermined position” of the sample or that the position of the electrophoresed sample would be known before electrophoresis. Thus, this limitation is deemed to be new matter. Claims 7-10 and 16-17 are further rejected by virtue of their dependence upon and because they fail to cure the deficiencies of claim 6. 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 6-10 and 16-17 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 6 recites “determining a position in the lane of the electrophoresed sample that matches a predetermined position” in lines 19-20. In light of the specification, it is unclear how the position of the electrophoresed sample is “predetermined.” Claims 7-10 and 16-17 are further rejected by virtue of their dependence upon and because they fail to cure the deficiencies of indefinite claim 6. Claim 7 recites the limitation "the polyelectrolyte" in line 2. There is insufficient antecedent basis for this limitation in the claim. Claim 8 recites the limitation "the polyelectrolyte" in line 2. There is insufficient antecedent basis for this limitation in the claim. Claim 9 recites the limitation "the polyelectrolyte" in line 2. There is insufficient antecedent basis for this limitation in the claim. Claim 10 recites the limitation "the polyelectrolyte" in line 2. There is insufficient antecedent basis for this limitation in the claim. Claim 17 recites the limitation "the polyelectrolyte" in line 2. There is insufficient antecedent basis for this limitation in the claim. Response to Arguments Applicant's arguments, see Remarks pgs. 7-13, filed 8/12/2025, with respect to the 35 U.S.C. § 103 rejections have been fully considered, and all 35 U.S.C. § 103 rejections from the previous office action are withdrawn in view of the Applicant’s amendment. However, applicant’s arguments are moot in view of the new grounds of rejection. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to KAYLEE Y TSENG whose telephone number is (703)756-5542. The examiner can normally be reached Mon - Fri 9-6 PT. 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, Luan Van can be reached at (571)272-8521. 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. /K.T./Examiner, Art Unit 1795 /LUAN V VAN/Supervisory Patent Examiner, Art Unit 1795
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Prosecution Timeline

Show 1 earlier event
Jan 03, 2025
Non-Final Rejection mailed — §112
Apr 01, 2025
Response Filed
May 22, 2025
Final Rejection mailed — §112
Aug 12, 2025
Request for Continued Examination
Aug 15, 2025
Response after Non-Final Action
Oct 06, 2025
Non-Final Rejection mailed — §112
Dec 19, 2025
Response Filed
Jul 15, 2026
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

5-6
Expected OA Rounds
61%
Grant Probability
99%
With Interview (+48.6%)
3y 3m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 286 resolved cases by this examiner. Grant probability derived from career allowance rate.

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