Examiner Brian L Casler
Grant ratio: 3.5% (20th percentile in Art Unit 3791 among examiners with at least 20 applications). Average office actions per grant: 1.67. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 70625
- Primary art unit
- 3791
- Work group
- 3790
- Technology center
- 3700
- Applications
- 85
- Granted applications
- 3
- Examiner phone
- (571) 272-4956
- Supervisor
- Charles Marmor
- Supervisor phone
- (571) 272-4730
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 104 | 35.0% | 2.08 |
| Group | 334 | 38.9% | 2.25 |
| Tech Center | 2,671 | 48.4% | 2.01 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 8 | 9.4% |
| 1 OA | 60 | 70.6% |
| 2 OAs | 10 | 11.8% |
| 3 OAs | 2 | 2.4% |
| 4 OAs | 3 | 3.5% |
| 5+ OAs | 2 | 2.4% |
Each application is counted once. “5+” includes all higher counts.
Grant history
Recent ratios may be lower while applications remain pending.
Yearly counts
| Year | Applications | Grants | Grant rate |
|---|---|---|---|
| 2008 | 1 | 0 | 0.0% |
| 2009 | 1 | 1 | 100.0% |
| 2010 | 4 | 0 | 0.0% |
| 2011 | 2 | 1 | 50.0% |
| 2025 | 16 | 1 | 6.3% |
| 2026 | 61 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 77 | 9.1% | 19.5% | 58.4% | 18.2% |
| Action 2 | 17 | 5.9% | 17.6% | 64.7% | 11.8% |
| Action 3 | 7 | 14.3% | 28.6% | 71.4% | 14.3% |
| Action 4 | 5 | 0.0% | 0.0% | 80.0% | 0.0% |
| Action 5 | 2 | 50.0% | 0.0% | 50.0% | 0.0% |
Section 101 rejections
Last 3 years: 2023-08-28–2026-08-28. All years includes every dated office action in the data.
By year
0.0%
50.0%
0.0%
0.0%
2025: August memo
8.7%
9.7%
Each bar is the percentage of office actions with a §101 rejection.
PTAB appeals
No PTAB decisions could be matched to this examiner.
Older and transferred applications may not have a reliable examiner match. Data through Aug. 27, 2026.