Examiner Daniel Wonsuk Chung
Grant ratio: 27.7% (16th percentile in Art Unit 2659 among examiners with at least 20 applications). Average office actions per grant: 1.96. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 98056
- Primary art unit
- 2659
- Work group
- 2650
- Technology center
- 2600
- Applications
- 83
- Granted applications
- 23
- Examiner phone
- (571) 272-1345
- Supervisor
- Pierre-Louis Desir
- Supervisor phone
- (571) 272-7799
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 27 | 58.8% | 1.91 |
| Group | 210 | 59.4% | 1.87 |
| Tech Center | 1,754 | 57.4% | 1.88 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 2 | 2.4% |
| 1 OA | 25 | 30.1% |
| 2 OAs | 21 | 25.3% |
| 3 OAs | 18 | 21.7% |
| 4 OAs | 11 | 13.3% |
| 5+ OAs | 6 | 7.2% |
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 |
|---|---|---|---|
| 2023 | 12 | 5 | 41.7% |
| 2024 | 24 | 15 | 62.5% |
| 2025 | 15 | 3 | 20.0% |
| 2026 | 32 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 81 | 2.5% | 3.7% | 91.4% | 0.0% |
| Action 2 | 56 | 5.4% | 1.8% | 91.1% | 1.8% |
| Action 3 | 35 | 2.9% | 0.0% | 88.6% | 2.9% |
| Action 4 | 17 | 0.0% | 0.0% | 94.1% | 0.0% |
| Action 5 | 6 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 6 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 7 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 8 | 1 | 0.0% | 0.0% | 100.0% | 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%
2024: AI examples
1.7%
2025: August memo
3.3%
7.3%
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.