Examiner Changhyun Yi
Grant ratio: 83.8% (75th percentile in Art Unit 2826 among examiners with at least 20 applications). Average office actions per grant: 1.38. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 91297
- Primary art unit
- 2826
- Work group
- 2820
- Technology center
- 2800
- Applications
- 1,131
- Granted applications
- 948
- Examiner phone
- (571) 270-7799
- Supervisor
- Eliseo Ramos-Feliciano
- Supervisor phone
- (571) 272-7925
Save this analysis
Download this examiner report.
Log in / Sign Up to exportPeer comparisons
| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 22 | 81.0% | 1.71 |
| Group | 207 | 71.2% | 1.64 |
| 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 | 5 | 0.4% |
| 1 OA | 789 | 69.8% |
| 2 OAs | 274 | 24.2% |
| 3 OAs | 41 | 3.6% |
| 4 OAs | 18 | 1.6% |
| 5+ OAs | 4 | 0.4% |
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 |
|---|---|---|---|
| 2014 | 14 | 12 | 85.7% |
| 2015 | 86 | 74 | 86.0% |
| 2016 | 80 | 70 | 87.5% |
| 2017 | 85 | 71 | 83.5% |
| 2018 | 107 | 96 | 89.7% |
| 2019 | 59 | 54 | 91.5% |
| 2020 | 114 | 110 | 96.5% |
| 2021 | 92 | 90 | 97.8% |
| 2022 | 107 | 105 | 98.1% |
| 2023 | 110 | 110 | 100.0% |
| 2024 | 89 | 88 | 98.9% |
| 2025 | 101 | 68 | 67.3% |
| 2026 | 87 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 1,126 | 1.9% | 19.0% | 58.2% | 10.5% |
| Action 2 | 337 | 4.7% | 14.2% | 72.1% | 3.9% |
| Action 3 | 63 | 1.6% | 7.9% | 87.3% | 1.6% |
| Action 4 | 22 | 0.0% | 9.1% | 90.9% | 0.0% |
| Action 5 | 4 | 0.0% | 0.0% | 75.0% | 25.0% |
| Action 6 | 3 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 7 | 2 | 0.0% | 0.0% | 50.0% | 50.0% |
| 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%
0.0%
2014: Alice
0.0%
0.0%
0.0%
9.8%
10.1%
2019: PEG
0.0%
1.3%
1.0%
1.6%
0.7%
2024: AI examples
0.0%
2025: August memo
0.8%
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.