Last updated: July 23, 2026

Application No. 18/371,097

Nasal Cannula With at Least One Valve

Final Rejection

Filed

Sep 21, 2023

Priority

Sep 21, 2022 — provisional 63/408,653

Examiner

DITMER, KATHRYN ELIZABETH

Art Unit

3785

Tech Center

3700 — Mechanical Engineering & Manufacturing

Assignee

Oxfo Corporation

OA Round

2 (Final)

Interview Optional

— +49.6% interview lift. Interview already conducted in this application's prosecution history. This examiner has a 58% grant rate with +49.6% interview lift. Since an interview has already been tried, recommend written response with narrowed claims based on precedent claim evolution patterns.

Based on 760 resolved cases, 2023–2026

Examiner Intelligence

DITMER, KATHRYN ELIZABETH View full profile →

Grants 58% of resolved cases

Career Allowance Rate

439 granted / 760 resolved

-12.2% vs TC avg

Strong +50% interview lift

Without

With

+49.6%

Interview Lift

resolved cases with interview

Typical timeline

3y 6m

Avg Prosecution

39 currently pending

Career history

811

Total Applications

across all art units

Statute-Specific Performance

§101

0.6%

-39.4% vs TC avg

§103

78.6%

+38.6% vs TC avg

§102

9.6%

-30.4% vs TC avg

§112

9.8%

-30.2% vs TC avg

Black line = Tech Center average estimate • Based on career data from 760 resolved cases

Prosecution Timeline

Sep 21, 2023

Application Filed

Apr 01, 2025

Non-Final Rejection mailed

Apr 04, 2025

Examiner Interview Summary

Apr 04, 2025

Applicant Interview (Telephonic)

Jul 01, 2025

Response Filed

Sep 09, 2025

Final Rejection mailed (current)

Precedent Cases

Applications granted by this same examiner with similar technology

17/629,494

Patent 12673171

DISPENSER WITH LID HANDLE

4y 5m to grant Granted Jul 07, 2026

18/020,530

Patent 12673172

UNIT DOSE DRY POWDER INHALER WITH BLISTER CAVITY INCLUDING A BOWL, CHANNEL AND TUBE

3y 4m to grant Granted Jul 07, 2026

18/361,220

Patent 12667677

CAPSULE INHALERS AND METHODS OF USING SAME

2y 11m to grant Granted Jun 30, 2026

17/897,110

Patent 12661466

SEQUENTIAL STYLET

3y 10m to grant Granted Jun 23, 2026

17/916,889

Patent 12661469

TRACHEOSTOMY TUBES AND THEIR MANUFACTURE

3y 8m to grant Granted Jun 23, 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

3-4

Expected OA Rounds

58%

Grant Probability

99%

With Interview (+49.6%)

3y 6m (~8m remaining)

Median Time to Grant

Moderate

PTA Risk

Based on 760 resolved cases by this examiner. Grant probability derived from career allowance rate.