Prosecution Insights
Last updated: October 02, 2026
Application No. 18/916,866

SILICA-COATED STIMULUS-RESPONSIVE POLYMERIC NANOPARTICLES

Non-Final OA §103
Filed
Oct 16, 2024
Priority
Oct 16, 2023 — provisional 63/544,418
Examiner
PATEL, RONAK C
Art Unit
Tech Center
Assignee
Regents of the University of Minnesota
OA Round
1 (Non-Final)
51%
Grant Probability
Moderate
1-2
OA Rounds
1y 7m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 51% of resolved cases
51%
Career Allowance Rate
345 granted / 674 resolved
-8.8% vs TC avg
Strong +56% interview lift
Without
With
+56.4%
Interview Lift
resolved cases with interview
Typical timeline
3y 6m
Avg Prosecution
42 currently pending
Career history
727
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
71.9%
+31.9% vs TC avg
§102
5.9%
-34.1% vs TC avg
§112
19.0%
-21.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 674 resolved cases

Office Action

§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 . Election/Restrictions Applicant’s election without traverse of Group I claims 1-14 in the reply filed on 08/03/2026 is acknowledged. Claims 15-20 are withdrawn from further consideration pursuant to 37 CFR 1.142(b) as being drawn to a nonelected claims, there being no allowable generic or linking claim. Election was made without traverse in the reply filed on 08/03/2026. Claim Rejections - 35 USC § 103 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. Claim(s) 1-9 and 13-14 are rejected under 35 U.S.C. 103 as being unpatentable over Kim et al. (US 2016/0086737) in view of Cui et al. (US 2010/0330421). Regarding claims 1, 3, 5 Kim discloses nanocomposite is in a core-shell structure comprising a core and a shell covering the core, and wherein the core comprises a metal, a metal oxide, or both, and the shell comprises an inorganic material, a conductive polymer, or both, or the core comprises an inorganic material, a conductive polymer, or both, and the shell comprises a metal, a metal oxide, or both (claim 2). The nanocomposite layer has a thickness of 1 nm to 10 microns (para 0010) and nanocomposite may have a particle diameter of 2 nm to 200 nm (para 0017). The conductive polymer may include at least one polymer selected from the group consisting of polyaniline (PANI), polythiophene (PT), polypyrrole (PPy), polyindole (PIN), polyacetylene (PAc), polyphenylene sulfide (PPS) (para 0050), where polyphenylene sulfide is redox-responsive polymer. Thus, it would be obvious to one of ordinary skill in the art to form a nanocomposite comprising a core comprising a conductive polymer such as polyphenylene sulfide (correspond to stimulus responsive polymer) and a shell comprising a metal oxide. However, Kim fails to disclose that the shell metal oxide comprises silica coating. Whereas, Cui discloses nanostructures containing electrochemically active materials, battery electrodes containing these nanostructures for use in electrochemical batteries, such as lithium-ion batteries, and methods of forming the nanostructures and battery electrodes. The nanostructures include conductive cores, inner shells containing active materials, and outer shells partially coating the inner shells (abstract). In certain embodiments, the inner shell includes, germanium, tin, aluminum, titanium, carbon, as well as oxide and nitrides of the above-mentioned materials (e.g., silicon oxide) (para 0042). It would have been obvious to one of ordinary skill in the art at the time the application was filed to include silicon oxide of Cui as the metal oxide in the shell of Kim to form silica coating motivated by the desire to have high electrochemical capacity. Regarding claim 2, As Kim discloses conductive polymer comprising polyphenylene sulfide (redox-responsive polymer) as presently claimed, therefore the stimulus responsive polymer would intrinsically swell in response to a stimulus. Regarding claims 4, 6 and 7, these claims depend on claim 3 and recite additional optional features. Kim teaches stimulus responsive polymer comprising redox-responsive polymer limitation of claim 3 as stated above, the additional limitations of claims 4, 6-7 are not required for the teaching of claim 3 and, therefore, their absence from Kim does not negate the disclosure of claim 3. Regarding claim 8-9, Kim in view of Cui discloses the shell may include a first shell formed on a surface of the core and including the metal (second coating of claim 8) and a second shell formed on an outer surface of the first shell and including the metal oxide (i.e. silica coating). Regarding claims 13-14, Kim discloses composition comprising nanoparticles and carrier comprising liquid (claims 13-19). Claim(s) 10-12 are rejected under 35 U.S.C. 103 as being unpatentable over Kim et al. (US 2016/0086737) in view of Cui et al. (US 2010/0330421) as applied to claim 1, further in view of Kurtin et al. (US 2015/0053914). Regarding claims 10-12, Kim in view of Cui fails to disclose that the nanoparticle further comprising cargo molecule comprising fertilizer attached to the surface of the silica coating. Whereas, Kurtin discloses the method also involves, subsequently, forming a silica-based insulator layer on the nanocrystals from a reaction involving the silicon-containing silica precursor species. The method also involves adding additional amounts of the silicon-containing silica precursor species after initial forming of the silica-based insulator layer while continuing to form the silica-based insulator layer to finally encapsulate each of the nanocrystals (abstract). In an embodiment, one or more of the semiconductor structures further includes a coupling agent covalently bonded to an outer surface of the insulator layer. For example, in one such embodiment, the insulator layer includes or is a layer of silica (SiO.sub.x), and the coupling agent is a silane coupling agent, e.g., having the formula X.sub.nSiY.sub.4-n, where X is a functional group capable of bonding with the matrix material and is one such as, but not limited to, hydroxyl, alkoxy, isocyanate, carboxyl, epoxy, amine, urea, vinyl, amide, aminoplast and silane, Y is a functional group such as, but not limited to, hydroxyl, phenoxy, alkoxy, hydroxyl ether, silane or aminoplast, and n is 1, 2 or 3 (para 0103). It would have been obvious to one of ordinary skill in the art at the time the application was filed to attach coupling agent comprising urea (fertilizer) as taught by Kurtin on to the shell of Kim motivated by the desire to have improved bonding. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to RONAK C PATEL whose telephone number is (571)270-1142. The examiner can normally be reached M-F 8:30AM-6:30PM (FLEX). 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, ALICIA CHEVALIER can be reached at 5712721490. 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. /RONAK C PATEL/Primary Examiner, Art Unit 1788
Read full office action

Prosecution Timeline

Oct 16, 2024
Application Filed
Aug 19, 2026
Non-Final Rejection mailed — §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

1-2
Expected OA Rounds
51%
Grant Probability
99%
With Interview (+56.4%)
3y 6m (~1y 7m remaining)
Median Time to Grant
Low
PTA Risk
Based on 674 resolved cases by this examiner. Grant probability derived from career allowance rate.

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