Prosecution Insights
Last updated: October 25, 2026
Application No. 18/080,781

DEFENDING WEB BROWSERS AGAINST MAN-IN-THE-MIDDLE ATTACKS

Non-Final OA §103
Filed
Dec 14, 2022
Priority
Dec 14, 2021 — provisional 63/289,168
Examiner
OSMAN, RAMY M
Art Unit
2457
Tech Center
2400 — Computer Networks
Assignee
Island Technology Inc.
OA Round
3 (Non-Final)
79%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
70%
With Interview

Examiner Intelligence

Grants 79% — above average
79%
Career Allowance Rate
594 granted / 753 resolved
+20.9% vs TC avg
Minimal -9% lift
Without
With
+-9.2%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
30 currently pending
Career history
794
Total Applications
across all art units

Statute-Specific Performance

§101
10.6%
-29.4% vs TC avg
§103
39.7%
-0.3% vs TC avg
§102
26.1%
-13.9% vs TC avg
§112
16.6%
-23.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 753 resolved cases

Office Action

§103
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 . DETAILED ACTION This action is responsive to amendment filed March 5, 2026. Status of Claims Applicant amended the claims in the filed amendment. Claims 1-3 remain pending. Response to Arguments Applicant’s arguments, filed 3/5/26, have been fully considered and are persuasive. However a new grounds of rejection is made under 103 based on Hallin in view of Frederick, as presented below. 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 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 1-3 are rejected under 35 U.S.C. 103 as being unpatentable over Hallin et al (US Publication 20030182549) in view of Frederick et al (US Publication 20180262345). In reference to claim 1, Hallin teaches a computer network security method comprising: configuring a web browser with a capability of determining whether a root certificate authority appears in a first list of trusted root certificate authorities that is maintained by an operating system of a host computer that hosts the web browser; (see at least ¶s 27,28, which teaches a web browser determining a trusted root certificate authority appears in a list maintained by the host computer system that hosts the browser) configuring the web browser with a capability of determining whether the root certificate authority was included in the first list at the time that the operating system was installed on the host computer; (see at least ¶ 29, which teaches determining the root certificate was included in the list at the time the operating system was created by a manufacturer and inherently installed on the computer) configuring the web browser with a capability of determining whether the root certificate authority was included in the first list by the operating system after the time that the operating system was installed on the host computer; (see at least ¶s 36,37, which teaches determining if the certificate authority was included in the list by the operating system after the operating system was installed) configuring the web browser with a capability of determining whether the root certificate authority appears in a second list of trusted root certificate authorities that is provided to the web browser by an administrator; (see at least ¶ 38, which teaches determining if the certificate authority appears in a second list of authorities that is provided to the browser by server/administrator) configuring the web browser to determine whether a certificate meets predefined invalidation criteria associated with the certificate's root certificate authority by determining that the certificate's root certificate authority appears in the first list but was not included in the first list at the time that the operating system was installed on the host computer; (see at least ¶ 45, which teaches periodically determining the validity of the certificate authority and determining to include a new certificate authority in the list when the new certificate authority was not initially included in the list at the time of operating system installation) configuring the web browser to determine whether the certificate meets the predefined invalidation criteria by determining that the certificate's root certificate authority appears in the first list but was not included in the first list by the operating system after the operating system was installed on the host computer; (see at least ¶ 43, which teaches determining the validity of the certificate authority and appears in the list but was not included in the list after the operating system was installed) configuring the web browser to cease to communicate with a party that provided the certificate to the web browser responsive to the web browser determining that the certificate meets the predefined invalidation criteria (see at least ¶s 40,42, which teaches responsive to determining the certificate is invalid/untrustworthy, then terminating communications). Hallin fails to explicitly teach determine whether a certificate meets predefined invalidation criteria associated with the certificate's root certificate. However, Frederick teaches an improved secure certificate system that checks if a certificate authority information appears in a list, and discloses determining if a certificate meets predefined invalidation criteria and thresholds associated with the certificate (see Frederick, at least Abstract and ¶s 106-108). It would have been obvious for one of ordinary skill in the art before the effective filing date of the invention to modify Hallin based on the teachings of Frederick for the purpose of mitigating risks by ensuring the validity of the certificate and avoiding compromised certificate authorities. In reference to claim 2, this is taught by Hallin, at least ¶s 36-38, which teaches certificate validation, and Frederick, at least ¶s 106-108, which teaches determining if the certificate meets invalidity criteria. It would have been obvious for one of ordinary skill in the art before the effective filing date of the invention to modify Hallin based on the teachings of Frederick for the reasons as presented in claim 1. In reference to claim 3, this is taught by Hallin, at least ¶s 37-39,42, which teaches determining the certificate authority does not appear in the first list or the second list. Conclusion For any subsequent response that contains new/amended claims, Applicant is required to cite its corresponding support in the specification. (See MPEP chapter 2163.03 section (I.) and chapter 2163.04 section (I.) and chapter 2163.06) Applicant may not introduce any new matter to the claims or to the specification. In formulating a response/amendment, Applicant is encouraged to take into consideration the prior art made of record but not relied upon, as it is considered pertinent to applicant's disclosure. See previous Form 892. Contact & Status Any inquiry concerning this communication or earlier communications from the examiner should be directed to RAMY M OSMAN whose telephone number is (571)272-4008. The examiner can normally be reached Mon-Fri, 9AM-5PM. 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, Ario Etienne can be reached at 571-272-4001. 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. /RAMY M OSMAN/ Primary Examiner, Art Unit 2457 August 20, 2026
Read full office action

Prosecution Timeline

Dec 14, 2022
Application Filed
May 14, 2025
Non-Final Rejection mailed — §103
Aug 28, 2025
Response Filed
Dec 05, 2025
Final Rejection mailed — §103
Mar 05, 2026
Request for Continued Examination
Mar 17, 2026
Response after Non-Final Action
Sep 09, 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

3-4
Expected OA Rounds
79%
Grant Probability
70%
With Interview (-9.2%)
3y 3m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 753 resolved cases by this examiner. Grant probability derived from career allowance rate.

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