Examiner Chat C. Do
Grant ratio: 38.6% (7th percentile in Art Unit 2193 among examiners with at least 20 applications). Average office actions per grant: 2.14. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 79507
- Primary art unit
- 2193
- Work group
- 2190
- Technology center
- 2100
- Applications
- 197
- Granted applications
- 76
- Examiner phone
- (571) 272-3721
- Supervisor
- Dede Zecher
- Supervisor phone
- (571) 272-0800
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 36 | 55.4% | 1.85 |
| Group | 238 | 52.6% | 2.03 |
| Tech Center | 1,781 | 52.8% | 2.19 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 5 | 2.5% |
| 1 OA | 90 | 45.7% |
| 2 OAs | 49 | 24.9% |
| 3 OAs | 24 | 12.2% |
| 4 OAs | 23 | 11.7% |
| 5+ OAs | 6 | 3.0% |
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 | 57 | 30 | 52.6% |
| 2009 | 52 | 28 | 53.8% |
| 2010 | 39 | 15 | 38.5% |
| 2012 | 1 | 1 | 100.0% |
| 2013 | 4 | 0 | 0.0% |
| 2014 | 6 | 0 | 0.0% |
| 2015 | 8 | 1 | 12.5% |
| 2016 | 4 | 0 | 0.0% |
| 2017 | 1 | 0 | 0.0% |
| 2020 | 1 | 1 | 100.0% |
| 2025 | 10 | 0 | 0.0% |
| 2026 | 14 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 192 | 13.0% | 24.0% | 51.0% | 4.7% |
| Action 2 | 102 | 25.5% | 19.6% | 45.1% | 2.0% |
| Action 3 | 53 | 26.4% | 11.3% | 56.6% | 0.0% |
| Action 4 | 29 | 13.8% | 6.9% | 48.3% | 10.3% |
| Action 5 | 6 | 0.0% | 0.0% | 50.0% | 16.7% |
| Action 6 | 2 | 0.0% | 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
24.4%
20.2%
4.3%
0.0%
0.0%
2014: Alice
7.7%
0.0%
0.0%
0.0%
0.0%
0.0%
2025: August memo
27.3%
21.4%
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.