Examiner Richard K. Chang
Grant ratio: 89.2% (98th percentile in Art Unit 2464 among examiners with at least 20 applications). Average office actions per grant: 2.30. Most common rejection type: §103.
Appears inactive
Last office action in data: October 2017
Examiner record
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 24 | 67.1% | 1.93 |
| Group | 225 | 60.1% | 2.07 |
| Tech Center | 1,754 | 58.4% | 2.14 |
| 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 | 78 | 38.4% |
| 2 OAs | 59 | 29.1% |
| 3 OAs | 26 | 12.8% |
| 4 OAs | 24 | 11.8% |
| 5+ OAs | 16 | 7.9% |
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 |
|---|---|---|---|
| 2011 | 26 | 21 | 80.8% |
| 2012 | 30 | 29 | 96.7% |
| 2013 | 37 | 32 | 86.5% |
| 2014 | 28 | 25 | 89.3% |
| 2015 | 22 | 21 | 95.5% |
| 2016 | 41 | 35 | 85.4% |
| 2017 | 19 | 18 | 94.7% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 203 | 1.5% | 36.0% | 57.1% | 1.5% |
| Action 2 | 125 | 0.0% | 18.4% | 80.0% | 1.6% |
| Action 3 | 66 | 0.0% | 6.1% | 87.9% | 3.0% |
| Action 4 | 40 | 0.0% | 0.0% | 95.0% | 2.5% |
| Action 5 | 16 | 6.3% | 12.5% | 81.3% | 0.0% |
| Action 6 | 7 | 14.3% | 42.9% | 42.9% | 0.0% |
| Action 7 | 4 | 0.0% | 25.0% | 75.0% | 0.0% |
| Action 8 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 9 | 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%
2014: Alice
0.0%
1.6%
4.3%
4.8%
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.