Matthew John Kasztejna
USPTO Patent Examiner·Active 2023 to 2026
Matthew John Kasztejna is a USPTO patent examiner who has handled 34 ex parte reexaminations between 2023 and 2026, with 30 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
Technology mix
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 — 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
Recent reexaminations (showing 25 of 34)
| Control # | Filed | Patent | Title | Pendency | Status |
|---|---|---|---|---|---|
| 90/016,127 | Apr 2, 2026 | 12,440,321 | ATTACHMENT FOR AN ORAL CARE DEVICE HANDLE | — | Open |
| 90/016,045 | Mar 13, 2026 | 11,173,016 | Fixation Base and Guides for Dental Prosthesis Installation | — | Open |
| 90/016,046 | Mar 13, 2026 | 11,576,755 | Fixation Base and Guides for Dental Prosthesis Installation | — | Open |
| 90/015,969 | Feb 23, 2026 | 12,304,675 | MATERIAL ENCAPSULATION DEVICE | — | Open |
| 90/015,983 | Feb 20, 2026 | 12,036,079 | ATTACHMENT FOR AN ORAL CARE DEVICE HANDLE | — | Open |
| 90/015,921 | Jan 28, 2026 | 11,703,060 | NECK-HANGING FAN | — | Open |
| 90/015,766 | Dec 10, 2025 | 12,161,473 | ELECTROCARDIOGRAPHY PATCH | — | Open |
| 90/015,738 | Dec 2, 2025 | 12,484,745 | HANDHELD EXTRACTION CLEANER WITH LIQUID MOVEMENT MITIGATION | — | Open |
| 90/015,626 | Oct 22, 2025 | 9,332,766 | INDUSTRIAL BAGUETTE TRAY | — | Open |
| 90/015,500 | Sep 5, 2025 | 11,300,260 | ELEVATED STRUCTURE-MOUNTED LIGHTING SYSTEM | — | Open |
| 90/015,470 | Aug 29, 2025 | 11,912,326 | WHEELED CART WITH BRAKING SYSTEM | — | Open |
| 90/015,405 | Jul 24, 2025 | 11,920,338 | FEED PAD WATER COLLECTION SYSTEM AND METHOD | — | Open |
| 90/015,397 | Jul 21, 2025 | 9,918,522 | RATCHET BELT SYSTEM AND RELATED ACCESSORIES | — | Open |
| 90/019,995 | Jun 13, 2025 | 8,287,482 | INTRAOCULAR IMPLANTS AND METHODS AND KITS THEREFOR | — | Open |
| 90/019,943 | May 21, 2025 | 12,157,606 | Re-configurable and re-sizable modular storage container system | — | Open |
| 90/019,928 | Apr 24, 2025 | 12,037,162 | CONTAINER APPARATUS | — | Open |
| 90/019,895 | Mar 31, 2025 | 7,156,694 | ELECTRICAL OUTLET PLUG STRIP | — | Open |
| 90/019,855 | Feb 21, 2025 | 8,593,349 | MINIATURE ANTENNA HAVING A VOLUMETRIC STRUCTURE | 11 mo | Closed |
| 90/019,824 | Jan 21, 2025 | 11,903,709 | FLUID CONTROL DEVICES AND METHODS OF USING THE SAME | — | Open |
| 90/019,825 | Jan 21, 2025 | 11,653,863 | FLUID CONTROL DEVICES AND METHODS OF USING THE SAME | — | Open |
| 90/019,823 | Jan 21, 2025 | 11,529,081 | FLUID CONTROL DEVICES AND METHODS OF USING THE SAME | — | Open |
| 90/019,728 | Nov 13, 2024 | 12,036,186 | ADJUSTABLE BABY SELF FEEDING PILLOW | — | Open |
| 90/019,650 | Sep 9, 2024 | 11,660,056 | Swinging Shielding System For Use With A Radiation Source | — | Open |
| 90/019,649 | Sep 9, 2024 | 11,660,056 | Swinging Shielding System For Use With A Radiation Source | — | Open |
| 90/019,651 | Sep 9, 2024 | 11,660,056 | Swinging Shielding System For Use With A Radiation Source | — | Open |
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.