Examiner Dieu H. Duong
Grant ratio: 74.5% (53rd percentile in Art Unit 2845 among examiners with at least 20 applications). Average office actions per grant: 1.73. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 82268
- Primary art unit
- 2845
- Work group
- 2840
- Technology center
- 2800
- Applications
- 1,064
- Granted applications
- 793
- Examiner phone
- (571) 272-8980
- Supervisor
- Dimary Cruz Lopez
- Supervisor phone
- (571) 270-7893
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 50 | 67.0% | 1.67 |
| Group | 231 | 68.9% | 1.60 |
| 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 | 0 | 0.0% |
| 1 OA | 603 | 56.6% |
| 2 OAs | 263 | 24.7% |
| 3 OAs | 103 | 9.7% |
| 4 OAs | 55 | 5.2% |
| 5+ OAs | 41 | 3.8% |
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 | 48 | 30 | 62.5% |
| 2009 | 68 | 43 | 63.2% |
| 2010 | 58 | 50 | 86.2% |
| 2011 | 70 | 56 | 80.0% |
| 2012 | 72 | 52 | 72.2% |
| 2013 | 68 | 40 | 58.8% |
| 2014 | 58 | 43 | 74.1% |
| 2015 | 63 | 46 | 73.0% |
| 2016 | 64 | 48 | 75.0% |
| 2017 | 50 | 32 | 64.0% |
| 2018 | 62 | 52 | 83.9% |
| 2019 | 52 | 49 | 94.2% |
| 2020 | 51 | 47 | 92.2% |
| 2021 | 59 | 51 | 86.4% |
| 2022 | 46 | 43 | 93.5% |
| 2023 | 51 | 43 | 84.3% |
| 2024 | 49 | 45 | 91.8% |
| 2025 | 43 | 23 | 53.5% |
| 2026 | 32 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 1,065 | 0.7% | 8.4% | 81.2% | 2.8% |
| Action 2 | 462 | 0.0% | 10.2% | 84.4% | 2.4% |
| Action 3 | 199 | 0.0% | 7.5% | 90.5% | 0.5% |
| Action 4 | 96 | 0.0% | 5.2% | 92.7% | 2.1% |
| Action 5 | 41 | 0.0% | 2.4% | 85.4% | 7.3% |
| Action 6 | 16 | 0.0% | 6.3% | 93.8% | 0.0% |
| Action 7 | 7 | 0.0% | 14.3% | 85.7% | 0.0% |
| Action 8 | 4 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 9 | 2 | 0.0% | 50.0% | 50.0% | 0.0% |
| Action 10 | 2 | 0.0% | 50.0% | 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%
0.0%
0.0%
1.1%
0.0%
0.0%
1.6%
2014: Alice
0.8%
0.0%
0.0%
0.0%
0.0%
2019: PEG
1.2%
1.1%
0.0%
0.0%
1.4%
2024: AI examples
0.0%
2025: August memo
0.0%
0.0%
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.