Examiner Ka Chun Leung
Examiner Ka Chun Leung appears to be very easy relative to their art unit, group, tech center, and USPTO peers. Their lifetime grant ratio is 74.7%, they average 1.66 office actions per granted patent, and their rejection profile is dominated by §103 and elevated §112 usage.
Difficulty vs AU
Very Easy
Difficulty vs Group
Very Easy
Difficulty vs TC
Very Easy
Difficulty vs USPTO
Very Easy
Average OA / Grant
1.66
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Examiner Details
- Observed Examiner Years
- 18 years (2008-2025)
- Tech Center
- 3600 - Transportation, Electronic Commerce, Construction, Agriculture, Licensing and Review
- Group
- 3640 - Aeronautics, Agriculture, Weaponry, Nuclear Systems, Licensing and Review
Metrics
- Applications Evaluated
- 158
- Granted Applications
- 118
- Non-Granted Applications
- 40
- Avg OA / Grant
- 1.66
- Last OA Observed
- March 2025 (15 months ago)
Context Comparison
| Scope | Examiners | Lifetime Grant Ratio | Avg OA / Grant |
|---|---|---|---|
| This Examiner | 1 | 74.7% | 1.66 |
| Art Unit | 30 | 58.9% | 1.76 |
| Group | 269 | 56.4% | 1.75 |
| Tech Center | 2,337 | 48.0% | 2.11 |
| USPTO | 16,116 | 54.8% | 1.98 |
Grant Timeline
Shaded region marks the last two observed years, where grant outcomes may lag due to recency.
| Year | Applications | Granted | Grant Rate |
|---|---|---|---|
| No observed data before 2008; examiner may not yet have been active in the available dataset. | |||
| 2008 | 57 | 38 | 66.7% |
| 2009 | 3 | 3 | 100.0% |
| No observed data for 2010-2021. | |||
| 2022 | 26 | 20 | 76.9% |
| 2023 | 23 | 18 | 78.3% |
| 2024 | 41 | 32 | 78.0% |
| 2025 | 8 | 7 | 87.5% |
| No observed data after 2025; examiner may have gone inactive or moved out of examining work. | |||
118 family-cache-validated grants; 0 OA-only grant signals.
Rejection Timeline
| OA # | Office Actions | § 101 Percentage | § 102 Percentage | § 103 Percentage | § 112 Percentage |
|---|---|---|---|---|---|
| 1 | 168 | 0.0% | 12.5% | 56.0% | 28.0% |
| 2 | 69 | 0.0% | 8.7% | 55.1% | 33.3% |
| 3 | 28 | 0.0% | 3.6% | 53.6% | 39.3% |
| 4 | 12 | 0.0% | 0.0% | 66.7% | 33.3% |
| 5 | 5 | 0.0% | 0.0% | 100.0% | 0.0% |
| 6 | 4 | 0.0% | 0.0% | 75.0% | 25.0% |
| 7 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |