ExamPat

Matthew John Kasztejna

USPTO Patent Examiner·Active 2023 to 2026

Matthew John Kasztejna is a USPTO patent examiner who has handled 42 ex parte reexaminations between 2023 and 2026, with 27 currently open. These reexams concentrate in Life Sciences & Consumer, Mechanical & Manufacturing, and Mechanical Engineering. ExamPat indexes the full prosecution record for each of these cases, including office-action grounds, certificate outcomes, and downstream PTAB and federal-circuit decisions.

Filings by year

2
23
11
24
15
25
14
26

Technology mix

Life Sciences & Consumer25 (60%)
Mechanical & Manufacturing6 (14%)
Mechanical Engineering5 (12%)
Electrical & Electronic3 (7%)
Physics & Instruments2 (5%)
Construction & Mining1 (2%)

Compare against all examiners

Eight side-by-side metrics: case volume, pendency, OAs per reexam, rejection mix, SNQ denial rate, certification rate, and PTAB appeal rate, with a Δ column showing where this examiner runs higher or lower than the corpus.

  • Average and median pendency, both for this examiner and the corpus
  • Rejection basis split (102 / 103 / 112) head-to-head
  • Certification, SNQ denial, and PTAB appeal rates

Certificate outcome distribution

How this examiner's certificates split across the six possible outcomes: all claims confirmed, confirmed with amendment, confirmed with new claims, mixed, or all claims canceled. Includes share comparison to the corpus distribution.

  • Count and share for each of the six outcome buckets
  • Δ vs. corpus distribution in percentage points
  • Useful for setting realistic patent-owner expectations

Event-to-event timing

Median time for this examiner's cases at each prosecution stage, from filing to first office action, filing to NIRC, and filing to certificate, with corpus comparison and sample size.

  • Median in months per transition
  • Side-by-side with the corpus median
  • n column showing how many of this examiner's cases completed each transition

vs. all examiners

Certificate outcome distribution

Event-to-event timing (median)

Recent reexaminations (showing 25 of 42)

View all in dashboard →
Control #FiledPatentTitlePendencyStatus
90/016,555Aug 28, 202610,413,706METHOD AND APPARATUS FOR INSERTING A CATHETER TUBE—Open
90/016,522Aug 13, 202612,415,033REAL TIME DRIP CHAMBER MONITOR—Open
90/016,516Aug 10, 202612,346,160WEARABLE COMPUTING DEVICE—Open
90/016,518Aug 10, 202612,422,889WEARABLE COMPUTING DEVICE—Open
90/016,467Jul 14, 202610,335,232Apparatus for using intense pulsed light to non-invasively treat blepharitis, dryeye, conjunctival blood vessels, pigmented lesions, and other problems of the eye and eyelid—Open
90/016,451Jul 7, 202610,161,571LED TUBE WITH SAFETY DEVICE—Open
90/016,362May 31, 202611,885,358BLIND FASTENER AND METHOD OF INSTALLATION THEREOF—Open
90/016,257May 8, 202611,338,835HIGH LOAD CAPACITY COLLAPSIBLE CARTS—Open
90/016,127Apr 2, 202612,440,321ATTACHMENT FOR AN ORAL CARE DEVICE HANDLE—Open
90/016,046Mar 13, 202611,576,755Fixation Base and Guides for Dental Prosthesis Installation—Closed
90/016,045Mar 13, 202611,173,016Fixation Base and Guides for Dental Prosthesis Installation—Closed
90/015,969Feb 23, 202612,304,675MATERIAL ENCAPSULATION DEVICE—Open
90/015,983Feb 20, 202612,036,079ATTACHMENT FOR AN ORAL CARE DEVICE HANDLE—Open
90/015,921Jan 28, 202611,703,060NECK-HANGING FAN—Open
90/015,766Dec 10, 202512,161,473ELECTROCARDIOGRAPHY PATCH—Open
90/015,738Dec 2, 202512,484,745HANDHELD EXTRACTION CLEANER WITH LIQUID MOVEMENT MITIGATION—Open
90/015,626Oct 22, 20259,332,766INDUSTRIAL BAGUETTE TRAY—Open
90/015,500Sep 5, 202511,300,260ELEVATED STRUCTURE-MOUNTED LIGHTING SYSTEM—Open
90/015,470Aug 29, 202511,912,326WHEELED CART WITH BRAKING SYSTEM—Open
90/015,405Jul 24, 202511,920,338FEED PAD WATER COLLECTION SYSTEM AND METHOD—Open
90/015,397Jul 21, 20259,918,522RATCHET BELT SYSTEM AND RELATED ACCESSORIES—Open
90/019,995Jun 13, 20258,287,482INTRAOCULAR IMPLANTS AND METHODS AND KITS THEREFOR—Open
90/019,943May 21, 202512,157,606Re-configurable and re-sizable modular storage container system16 moClosed
90/019,928Apr 24, 202512,037,162CONTAINER APPARATUS17 moClosed
90/019,895Mar 31, 20257,156,694ELECTRICAL OUTLET PLUG STRIP16 moClosed

Other USPTO reexam examiners

Get the full reexam analytics

Compare Matthew John Kasztejna against the full corpus, see the certificate-outcome split, drill into event timing, filter the case list, and export. Free to sign up.