Examiner Kaijiang Zhang
Grant ratio: 69.8% (97th percentile in Art Unit 1639 among examiners with at least 20 applications). Average office actions per grant: 1.53. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 89264
- Primary art unit
- 1639
- Work group
- 1630
- Technology center
- 1600
- Applications
- 703
- Granted applications
- 491
- Examiner phone
- (571) 272-5207
- Supervisor
- Heather Calamita
- Supervisor phone
- (571) 272-2876
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 18 | 44.9% | 2.16 |
| Group | 245 | 37.4% | 2.18 |
| Tech Center | 1,373 | 38.0% | 2.02 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 4 | 0.6% |
| 1 OA | 464 | 66.0% |
| 2 OAs | 153 | 21.8% |
| 3 OAs | 38 | 5.4% |
| 4 OAs | 25 | 3.6% |
| 5+ OAs | 19 | 2.7% |
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 |
|---|---|---|---|
| 2009 | 1 | 1 | 100.0% |
| 2012 | 13 | 6 | 46.2% |
| 2013 | 46 | 23 | 50.0% |
| 2014 | 47 | 29 | 61.7% |
| 2015 | 40 | 25 | 62.5% |
| 2016 | 51 | 32 | 62.7% |
| 2017 | 51 | 40 | 78.4% |
| 2018 | 56 | 45 | 80.4% |
| 2019 | 49 | 37 | 75.5% |
| 2020 | 56 | 46 | 82.1% |
| 2021 | 58 | 46 | 79.3% |
| 2022 | 53 | 49 | 92.5% |
| 2023 | 49 | 41 | 83.7% |
| 2024 | 48 | 45 | 93.8% |
| 2025 | 48 | 26 | 54.2% |
| 2026 | 37 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 699 | 1.6% | 26.0% | 53.8% | 10.2% |
| Action 2 | 235 | 9.4% | 28.9% | 44.7% | 11.5% |
| Action 3 | 82 | 11.0% | 20.7% | 54.9% | 8.5% |
| Action 4 | 44 | 9.1% | 22.7% | 54.5% | 9.1% |
| Action 5 | 19 | 5.3% | 21.1% | 68.4% | 5.3% |
| Action 6 | 7 | 14.3% | 14.3% | 71.4% | 0.0% |
| Action 7 | 4 | 25.0% | 0.0% | 75.0% | 0.0% |
| Action 8 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 9 | 1 | 0.0% | 0.0% | 0.0% | 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%
5.1%
2014: Alice
8.3%
11.8%
8.5%
5.8%
4.2%
2019: PEG
1.7%
0.0%
2.8%
0.0%
3.1%
2024: AI examples
1.7%
2025: August memo
1.8%
2.5%
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.