Prosecution Insights
Last updated: September 24, 2026
Application No. 18/418,121

METHODS OF TREATING LENNOX-GASTAUT SYNDROME USING FENFLURAMINE

Final Rejection §103§DOUBLEPATENT
Filed
Jan 19, 2024
Priority
Aug 24, 2015 — provisional 62/209,090 +2 more
Examiner
BORI, IBRAHIM D
Art Unit
1629
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Zogenix
OA Round
4 (Final)
44%
Grant Probability
Moderate
5-6
OA Rounds
9m
Est. Remaining
82%
With Interview

Examiner Intelligence

Grants 44% of resolved cases
44%
Career Allowance Rate
268 granted / 613 resolved
-16.3% vs TC avg
Strong +39% interview lift
Without
With
+38.7%
Interview Lift
resolved cases with interview
Typical timeline
3y 5m
Avg Prosecution
46 currently pending
Career history
656
Total Applications
across all art units

Statute-Specific Performance

§101
2.6%
-37.4% vs TC avg
§103
41.5%
+1.5% vs TC avg
§102
15.9%
-24.1% vs TC avg
§112
24.6%
-15.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 613 resolved cases

Office Action

§103 §DOUBLEPATENT
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 . Information Disclosure Statement The information disclosure statement (IDS) submitted on 06/03/2026, have been received and entered into the instant application. As reflected by the attached, completed copies of form PTO-1449, the Examiner has considered the cited reference to the extent that they comply with the provisions of 37 C.F.R. §1.97, §1.98, and MPEP §609. Status of the Claims Claims 19-49 are pending. Applicants’ arguments, filed 06/03/2026, have been fully considered. Rejections and/or objections not reiterated from previous Office actions are hereby withdrawn. The following rejections and/or objections are either reiterated or newly applied. They constitute the complete set of rejections and/or objections presently being applied to the instant application. Applicants’ amendments, filed on 06/03/2026, have each been entered into the record. Applicants have amended claims 19, 24 and 26. Applicants have newly added claim 44-49. Therefore, claims 19-49 are subject of the Office action below. Withdrawn Rejections: The rejection of claims 19-43 under 35 U.S.C. 103 as being unpatentable over: 1) Gastaut of record (J. Autism and Developmental Disorders, 1987) in view of Ceulemans of record (Epilepsia, 2012); and 2) Gastaut, Ceulemans and further in view of: 1) Al-Baradie of record (Neuroscience, 2013); and 2) Conry of record (Epilepsia, 2009), is overcome by the Applicants’ arguments and is, hereby, withdrawn. For example, Applicants argue on the grounds that case 6 & 7 patients of Gastaut that were referred for LGS, were diagnosed with Rett's syndrome. Applicants cite Table 1 of Gastaut in support of the Applicants' position. Please see pages 6-19 of Remarks filed on 06/03/2026. The rejection of 19-43 on the ground of nonstatutory double patenting as being unpatentable over claims of U.S. patent No. 12,144,787 in view of: 1) Gastaut of Record; and 2) Ceulemans of Record, is withdrawn because the Applicants argue on the grounds that the ‘787 patent claims a method for treating Rhett syndrome, whereas, the instant application claims a method for treating LGS, and the ‘787 patent specification fails to disclose use of FFA for treating LGS (see pages 19-20 of Remarks). Non-Statutory Double Patenting Rejection-Maintained The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. The rejection of claims 19-43 is maintained and newly added claims 44-49 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims of U.S. patent Nos: 1) 11,406,606; 2) 10,950,331; 3) 11,571,397; 4) 11,759,440; 5) 11,786,487; and 6) 11,634,377, for the reasons of record set forth in the previous Office action. Response to Applicants’ Arguments/Remarks Applicants’ Remarks filed on 06/03/2026, did not addressed the specific grounds of rejections as discussed in the previous Office action setting. Response The rejections will be maintained until a terminal disclaimer is filed or the claims are amended to obviate the rejections. For the reasons made of record in the previous Office action, the rejections are maintained. Conclusion No claim is allowable. THIS ACTION IS MADE FINAL. Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. 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 Correspondence Any inquiry concerning this communication or earlier communications from the examiner should be directed to IBRAHIM D BORI whose telephone number is (571)270-7020. The examiner can normally be reached on Monday through Friday 8:00AM-5:00PM(EST). If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, JEFFREY S LUNDGREN can be reached on 571-272-5541. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://pair-direct.uspto.gov. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /IBRAHIM D BORI/ Examiner, Art Unit 1629 /JEFFREY S LUNDGREN/Supervisory Patent Examiner, Art Unit 1629
Read full office action

Prosecution Timeline

Show 4 earlier events
Nov 08, 2024
Final Rejection mailed — §103, §DOUBLEPATENT
May 07, 2025
Notice of Allowance
Aug 07, 2025
Response after Non-Final Action
Aug 07, 2025
Request for Continued Examination
Aug 11, 2025
Response after Non-Final Action
Dec 04, 2025
Non-Final Rejection mailed — §103, §DOUBLEPATENT
Jun 03, 2026
Response Filed
Sep 04, 2026
Final Rejection mailed — §103, §DOUBLEPATENT (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12734137
METHODS OF TREATING LENNOX-GASTAUT SYNDROME USING FENFLURAMINE
6y 4m to grant Granted Sep 15, 2026
Patent 12735404
NOVEL INDIRUBIN DERIVATIVES HAVING HETEROBICYCLIC MOIETIES AND THE USE THEREOF
3y 7m to grant Granted Sep 15, 2026
Patent 12708621
SMALL MOLECULE BAX INHIBITORS AND USES THEREOF
2y 5m to grant Granted Aug 18, 2026
Patent 12692252
COMPOUND HAVING ANTI-TUMOR ACTIVITY AND USE THEREOF
2y 8m to grant Granted Jul 28, 2026
Patent 12686674
CRYSTAL FORM OF COMPOUND REPRESENTED BY FORMULA I, AND PREPARATION THEREFOR AND APPLICATION THEREOF
2y 6m to grant Granted Jul 21, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

Strategy Recommendation AI-generated — please review before filing

Get a prosecution strategy drawn from examiner precedents, rejection analysis, and claim mapping.
Typically takes 5-10 seconds — AI-generated, attorney review required before filing

Prosecution Projections

5-6
Expected OA Rounds
44%
Grant Probability
82%
With Interview (+38.7%)
3y 5m (~9m remaining)
Median Time to Grant
High
PTA Risk
Based on 613 resolved cases by this examiner. Grant probability derived from career allowance rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month