Examiner Ka Chun Leung
Grant ratio: 74.7% (90th percentile in Art Unit 3642 among examiners with at least 20 applications). Average office actions per grant: 1.66. Most common rejection type: §103.
Appears inactive
Last office action in data: March 2025
Examiner record
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 30 | 57.4% | 1.76 |
| Group | 281 | 52.9% | 1.75 |
| Tech Center | 2,381 | 46.2% | 2.12 |
| 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 | 99 | 58.9% |
| 2 OAs | 41 | 24.4% |
| 3 OAs | 16 | 9.5% |
| 4 OAs | 7 | 4.2% |
| 5+ OAs | 5 | 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 | 38 | 66.7% |
| 2009 | 3 | 3 | 100.0% |
| 2022 | 26 | 20 | 76.9% |
| 2023 | 23 | 18 | 78.3% |
| 2024 | 41 | 32 | 78.0% |
| 2025 | 8 | 7 | 87.5% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 168 | 0.0% | 12.5% | 56.0% | 28.0% |
| Action 2 | 69 | 0.0% | 8.7% | 55.1% | 33.3% |
| Action 3 | 28 | 0.0% | 3.6% | 53.6% | 39.3% |
| Action 4 | 12 | 0.0% | 0.0% | 66.7% | 33.3% |
| Action 5 | 5 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 6 | 4 | 0.0% | 0.0% | 75.0% | 25.0% |
| Action 7 | 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%
0.0%
0.0%
0.0%
0.0%
2024: AI examples
0.0%
2025: August memo
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.