Prosecution Insights
Last updated: July 17, 2026
Application No. 18/359,035

POLYSILOXANE VINYLIC MONOMERS AND USES THEREOF

Non-Final OA §102§103§112
Filed
Jul 26, 2023
Priority
Jul 27, 2022 — provisional 63/369,562
Examiner
KARST, DAVID THOMAS
Art Unit
1767
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Alcon Inc.
OA Round
1 (Non-Final)
64%
Grant Probability
Moderate
1-2
OA Rounds
0m
Est. Remaining
74%
With Interview

Examiner Intelligence

Grants 64% of resolved cases
64%
Career Allowance Rate
641 granted / 994 resolved
-0.5% vs TC avg
Moderate +10% lift
Without
With
+9.9%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
51 currently pending
Career history
1046
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
72.7%
+32.7% vs TC avg
§102
6.4%
-33.6% vs TC avg
§112
12.0%
-28.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 994 resolved cases

Office Action

§102 §103 §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 . Election/Restrictions Applicant’s election without traverse of Group I, claims 1-6, in the reply filed on 04/16/2026 is acknowledged. Claims 7-17 are withdrawn from further consideration pursuant to 37 CFR 1.142(b) as being drawn to a nonelected invention, there being no allowable generic or linking claim. Election was made without traverse in the reply filed on 04/16/2026. In the amendments filed on 04/16/2026, claims 1-6 are pending. Claims 7-17 are canceled. Priority Applicant’s claim for the benefit of a prior-filed application under 35 U.S.C. 119(e) or under 35 U.S.C. 120, 121, 365(c), or 386(c) is acknowledged. Claim Objections Claims 2-6 are objected to because of the following informalities: Claim 2 recites “a0 is zero or 1;” “a0 and a1 independent of each other are zero or 1” in lines 11 and 17, which is redundant. The Office suggests that Applicant delete “a0 is zero or 1;”. Appropriate correction is required. 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. Claims 1-6 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 1 recites the limitation “A polysiloxane vinylic monomer, (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence; (2) one sole terminal ethylenically unsaturated group; and (3) a quaternary ammonium moiety” in lines 1-3, which is indefinite because it is unclear how “A polysiloxane vinylic monomer”, “(1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence”. “(2) one sole terminal ethylenically unsaturated group”, and “(3) a quaternary ammonium moiety” are related to each other. Based on the specification of the instant application (p. 2), for further examination of the claims, this limitation is interpreted as “A polysiloxane vinylic monomer comprising (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence; (2) one sole terminal ethylenically unsaturated group; and (3) a quaternary ammonium moiety”. Claim Rejections - 35 USC § 102 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. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. Claim 1 is rejected under 35 U.S.C. 102(a)(1) as being anticipated by Parakka et al. (US 2012/0136087 A1). Regarding claim 1, Parakka teaches a compound that is PNG media_image1.png 114 702 media_image1.png Greyscale [0027], which reads on a polysiloxane vinylic monomer, (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence, (2) one sole terminal ethylenically unsaturated group, and (3) a quaternary ammonium moiety as claimed. Claim 1 is rejected under 35 U.S.C. 102(a)(1) as being anticipated by Schorzman et al. (US 2007/0242215 A1). Regarding claim 1, Schorzman teaches monomers that have the following structures PNG media_image2.png 108 850 media_image2.png Greyscale PNG media_image3.png 110 608 media_image3.png Greyscale PNG media_image4.png 106 608 media_image4.png Greyscale [0040], wherein n is an integer from 1 to about 300 [0013], which reads on a specific embodiment in which n is an integer from 5 to about 300, which reads on a polysiloxane vinylic monomer, (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence, (2) one sole terminal ethylenically unsaturated group, and (3) a quaternary ammonium moiety as claimed. Claim Rejections - 35 USC § 103 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. 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. Claims 1-5 are rejected under 35 U.S.C. 103 as being unpatentable over Han et al. (CN 107880213 A, machine translation in English or untranslated patent used for citation as indicated). Regarding claim 1, Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), which reads on a polysiloxane vinylic monomer, (1) a polysiloxane polymer chain comprising at least 2 dimethylsiloxane units in a consecutive sequence, (2) one sole terminal ethylenically unsaturated group, and (3) a quaternary ammonium moiety. Han teaches that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3,, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]), which suggests modifying Han’s PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups, which suggests (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence as claimed. Han does not teach a specific embodiment of (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence. Before the effective filing date of the claimed invention, one of ordinary skill in the art would have found it obvious to modify Han’s PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups. The proposed modification would read on (1) a polysiloxane polymer chain comprising at least 5 dimethylsiloxane units in a consecutive sequence as claimed. One of ordinary skill in the art would have been motivated to do so because it would have been obvious to try with a reasonable expectation of success because Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), and that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3,, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]). Examples of rationales that may support a conclusion of obviousness include "Obvious to try" – choosing from a finite number of identified, predictable solutions, with a reasonable expectation of success (MPEP 2143(I)(E)). Regarding claims 2-4, Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), wherein the siloxane quaternary ammonium salt monomer containing double bonds is methacryloyloxyethyltrimethylammonium chloride (translation [0027]), which reads on wherein the polysiloxane vinylic monomer is represented by formula (1) in which To is a linear C1 alkyl, X- is a counter anion, R1 and R2 independent of each other are a C1 alkyl, E0 is a monovalent radical of PNG media_image7.png 64 194 media_image7.png Greyscale , R0 is methyl, a0 is zero, X0 is O, n1 is an integer of 1, L1 is a divalent radical of PNG media_image8.png 54 312 media_image8.png Greyscale , a0 independently is zero, R3 independently is a linear C1 alkylene divalent radical, L2 is a linear C2 alkylene divalent radical, wherein in formula (1) E0 is a monovalent radical of PNG media_image9.png 62 176 media_image9.png Greyscale . Han teaches that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]). Based on Han’s PNG media_image5.png 118 2 media_image5.png Greyscale , the Office interprets Han’s OSi(CH3)3 for Han’s R4 in Han’s PNG media_image6.png 142 660 media_image6.png Greyscale to be Si(CH3)3. Han’s teachings therefore suggest modifying Han’s PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups and be terminated by the PNG media_image5.png 118 2 media_image5.png Greyscale group, which suggests n1 is an integer of 4 as claimed. Han does not teach a specific embodiment in which n1 is an integer of from 4 to 50, or wherein in formula (1) n1 is from 4 to 40. Before the effective filing date of the claimed invention, one of ordinary skill in the art would have found it obvious to modify Han’s PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups and be terminated by the PNG media_image5.png 118 2 media_image5.png Greyscale group. The proposed modification would read on in which n1 is an integer of 4 as claimed. One of ordinary skill in the art would have been motivated to do so because it would have been obvious to try with a reasonable expectation of success because Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), that the siloxane quaternary ammonium salt monomer containing double bonds is methacryloyloxyethyltrimethylammonium chloride (translation [0027]), and that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]). Examples of rationales that may support a conclusion of obviousness include "Obvious to try" – choosing from a finite number of identified, predictable solutions, with a reasonable expectation of success (MPEP 2143(I)(E)). Regarding claim 5, Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), wherein the siloxane quaternary ammonium salt monomer containing double bonds is methacryloyloxyethyltrimethylammonium chloride (translation [0027]). Han teaches that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]). Based on Han’s PNG media_image5.png 118 2 media_image5.png Greyscale , the Office interprets Han’s OSi(CH3)3 for Han’s R4 in Han’s PNG media_image6.png 142 660 media_image6.png Greyscale to be Si(CH3)3. Han’s teachings therefore suggest modifying Han’s formula PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups and be terminated by the PNG media_image5.png 118 2 media_image5.png Greyscale group, and to use an NH to substitute for the single-bonded O in the ester group of Han’s formula, which suggests wherein in formula (1) E0 is a monovalent radical of PNG media_image10.png 64 202 media_image10.png Greyscale in which RN1 is hydrogen as claimed. Han does not teach a specific embodiment wherein in formula (1) E0 is a monovalent radical of PNG media_image10.png 64 202 media_image10.png Greyscale in which RN1 is hydrogen or a C1-C6 alkyl. Before the effective filing date of the claimed invention, one of ordinary skill in the art would have found it obvious to modify Han’s formula PNG media_image5.png 118 2 media_image5.png Greyscale to have 5 PNG media_image5.png 118 2 media_image5.png Greyscale groups and be terminated by the PNG media_image5.png 118 2 media_image5.png Greyscale group, and to use an NH to substitute for the single-bonded O in the ester group of Han’s formula. The proposed modification would read on wherein in formula (1) E0 is a monovalent radical of PNG media_image10.png 64 202 media_image10.png Greyscale in which RN1 is hydrogen as claimed. One of ordinary skill in the art would have been motivated to do so because it would have been obvious to try with a reasonable expectation of success because Han teaches a siloxane quaternary ammonium salt monomer containing double bonds that has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), that the siloxane quaternary ammonium salt monomer containing double bonds is methacryloyloxyethyltrimethylammonium chloride (translation [0027]), and that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]). Examples of rationales that may support a conclusion of obviousness include "Obvious to try" – choosing from a finite number of identified, predictable solutions, with a reasonable expectation of success (MPEP 2143(I)(E)). Allowable Subject Matter Claim 6 would be allowable if rewritten to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action and to include all of the limitations of the base claim and any intervening claims. The following is a statement of reasons for the indication of allowable subject matter: Regarding claim 6, Han et al. (CN 107880213 A, machine translation in English or untranslated patent used for citation as indicated) renders obvious the polysiloxane vinylic monomer of claim 3 as explained above. Han does not teach that in formula (1) E0 is a monovalent radical of PNG media_image11.png 60 176 media_image11.png Greyscale . Although Han teaches that the siloxane quaternary ammonium salt monomer containing double bonds has the structure (translation [0069]) PNG media_image5.png 118 2 media_image5.png Greyscale (untranslated [0067]), that the siloxane quaternary ammonium salt monomer containing double bonds is methacryloyloxyethyltrimethylammonium chloride (translation [0027]), that the siloxane quaternary ammonium salt monomer containing double bonds has the structure shown in the formula (translation [0024]) PNG media_image6.png 142 660 media_image6.png Greyscale (untranslated [0021]), wherein A is O or NH, a = 2-5, b = 2-4, c = 2-5, R1 is CH3 or C2H5, R2 is CH3 or C2H5, R1 and R2 may be the same or different, R3, R4, and R5 are independently selected from OSi(CH3)3, OCH3, OC2H5, or C1-C3 alkyl groups, R3, R4, and R5 may be the same or different, and X is Cl, Br, or I (translated [0019], [0026]), which does not reads on wherein in formula (1) E0 is a monovalent radical of PNG media_image11.png 60 176 media_image11.png Greyscale . The prior art of record do not teach or suggest the polysiloxane vinylic monomer of claim 3 wherein in formula (1) E0 is a monovalent radical of PNG media_image11.png 60 176 media_image11.png Greyscale . Correspondence Any inquiry concerning this communication or earlier communications from the examiner should be directed to DAVID KARST whose telephone number is (571)270-7732. The examiner can normally be reached Monday-Friday 8:00 AM-5:00 PM. 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, Mark Eashoo can be reached at 571-272-1197. 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. /DAVID T KARST/Primary Examiner, Art Unit 1767
Read full office action

Prosecution Timeline

Jul 26, 2023
Application Filed
Jun 16, 2026
Non-Final Rejection mailed — §102, §103, §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
64%
Grant Probability
74%
With Interview (+9.9%)
2y 11m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 994 resolved cases by this examiner. Grant probability derived from career allowance rate.

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