Examiner Zonghua Du
Grant ratio: 40.0% (8th percentile in Art Unit 2444 among examiners with at least 20 applications). Average office actions per grant: 2.93. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 94969
- Primary art unit
- 2444
- Work group
- 2440
- Technology center
- 2400
- Applications
- 105
- Granted applications
- 42
- Examiner phone
- (408) 918-7596
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 30 | 64.2% | 2.35 |
| Group | 208 | 56.0% | 2.42 |
| 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 | 1 | 1.0% |
| 1 OA | 30 | 28.6% |
| 2 OAs | 24 | 22.9% |
| 3 OAs | 15 | 14.3% |
| 4 OAs | 20 | 19.0% |
| 5+ OAs | 15 | 14.3% |
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 |
|---|---|---|---|
| 2019 | 1 | 0 | 0.0% |
| 2020 | 5 | 4 | 80.0% |
| 2021 | 13 | 7 | 53.8% |
| 2022 | 16 | 9 | 56.3% |
| 2023 | 16 | 13 | 81.3% |
| 2024 | 10 | 4 | 40.0% |
| 2025 | 20 | 5 | 25.0% |
| 2026 | 24 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 104 | 0.0% | 2.9% | 91.3% | 1.9% |
| Action 2 | 74 | 0.0% | 1.4% | 95.9% | 0.0% |
| Action 3 | 50 | 0.0% | 2.0% | 96.0% | 2.0% |
| Action 4 | 35 | 0.0% | 0.0% | 97.1% | 2.9% |
| Action 5 | 15 | 0.0% | 0.0% | 86.7% | 6.7% |
| Action 6 | 11 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 7 | 5 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 8 | 2 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 9 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |
| Action 10 | 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
2019: PEG
0.0%
0.0%
0.0%
0.0%
0.0%
2024: AI examples
0.0%
2025: August memo
0.0%
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.