Examiner An Do
Grant ratio: 86.5% (86th percentile in Art Unit 2853 among examiners with at least 20 applications). Average office actions per grant: 1.17. Most common rejection type: §102.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 77374
- Primary art unit
- 2853
- Work group
- 2850
- Technology center
- 2800
- Applications
- 1,463
- Granted applications
- 1,266
- Examiner phone
- (571) 272-2143
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 52 | 63.5% | 1.63 |
| Group | 380 | 61.0% | 1.65 |
| Tech Center | 2,413 | 62.4% | 1.69 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 3 | 0.2% |
| 1 OA | 1,271 | 86.9% |
| 2 OAs | 143 | 9.8% |
| 3 OAs | 29 | 2.0% |
| 4 OAs | 12 | 0.8% |
| 5+ OAs | 5 | 0.3% |
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 | 90 | 82 | 91.1% |
| 2009 | 144 | 134 | 93.1% |
| 2010 | 126 | 120 | 95.2% |
| 2011 | 115 | 89 | 77.4% |
| 2012 | 114 | 98 | 86.0% |
| 2013 | 99 | 90 | 90.9% |
| 2014 | 87 | 82 | 94.3% |
| 2015 | 71 | 70 | 98.6% |
| 2016 | 61 | 55 | 90.2% |
| 2017 | 78 | 67 | 85.9% |
| 2018 | 56 | 53 | 94.6% |
| 2019 | 70 | 68 | 97.1% |
| 2020 | 55 | 52 | 94.5% |
| 2021 | 33 | 31 | 93.9% |
| 2022 | 35 | 32 | 91.4% |
| 2023 | 49 | 45 | 91.8% |
| 2024 | 62 | 57 | 91.9% |
| 2025 | 74 | 41 | 55.4% |
| 2026 | 44 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 1,460 | 5.6% | 38.9% | 34.9% | 2.4% |
| Action 2 | 189 | 8.5% | 31.2% | 40.7% | 2.1% |
| Action 3 | 46 | 8.7% | 19.6% | 60.9% | 2.2% |
| Action 4 | 17 | 17.6% | 17.6% | 64.7% | 0.0% |
| Action 5 | 5 | 40.0% | 20.0% | 40.0% | 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%
1.1%
0.0%
0.0%
0.8%
0.9%
2014: Alice
0.0%
1.2%
4.7%
19.1%
17.2%
2019: PEG
1.2%
0.0%
3.0%
2.5%
0.0%
2024: AI examples
25.0%
2025: August memo
29.1%
53.2%
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.