Examiner Duan Zhang
Examiner Duan Zhang appears to be about average relative to their peer examiners. Their lifetime grant ratio is 44.6%, they average 2.66 office actions per granted patent, and their rejection profile is dominated by §103 and occasional §101 rejections.
Difficulty vs AU
Very Easy
Difficulty vs Group
Very Easy
Difficulty vs TC
Very Hard
Difficulty vs USPTO
Very Hard
Average OA / Grant
2.66
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Examiner Details
- Observed Examiner Years
- 8 years (2019-2026)
- Phone
- (571) 272-4642
- Predicted Supervisor
- Neha Patel
- Supervisor Phone
- (571) 270-1492
- Tech Center
- 3600 - Transportation, Electronic Commerce, Construction, Agriculture, Licensing and Review
- Group
- 3680 - Business Methods: Electronic Shopping and Health Care
Metrics
- Applications Evaluated
- 202
- Granted Applications
- 90
- Non-Granted Applications
- 112
- Avg OA / Grant
- 2.66
- Last OA Observed
- July 2026 (1 months ago)
Context Comparison
| Scope | Examiners | Lifetime Grant Ratio | Avg OA / Grant |
|---|---|---|---|
| This Examiner | 1 | 44.6% | 2.66 |
| Art Unit | 57 | 34.6% | 3.08 |
| Group | 287 | 29.0% | 2.80 |
| Tech Center | 2,366 | 46.9% | 2.11 |
| USPTO | 16,347 | 53.5% | 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 2019; examiner may not yet have been active in the available dataset. | |||
| 2019 | 5 | 2 | 40.0% |
| 2020 | 16 | 2 | 12.5% |
| 2021 | 20 | 13 | 65.0% |
| 2022 | 25 | 12 | 48.0% |
| 2023 | 44 | 26 | 59.1% |
| 2024 | 31 | 24 | 77.4% |
| 2025 | 35 | 11 | 31.4% |
| 2026 | 26 | 0 | 0.0% |
90 family-cache-validated grants; 0 OA-only grant signals.
Rejection Timeline
| OA # | Office Actions | § 101 Percentage | § 102 Percentage | § 103 Percentage | § 112 Percentage |
|---|---|---|---|---|---|
| 1 | 201 | 8.5% | 2.5% | 84.6% | 1.5% |
| 2 | 128 | 17.2% | 0.8% | 79.7% | 0.8% |
| 3 | 80 | 21.3% | 0.0% | 75.0% | 2.5% |
| 4 | 47 | 17.0% | 0.0% | 83.0% | 0.0% |
| 5 | 29 | 17.2% | 0.0% | 79.3% | 0.0% |
| 6 | 17 | 5.9% | 0.0% | 94.1% | 0.0% |
| 7 | 7 | 0.0% | 0.0% | 100.0% | 0.0% |
| 8 | 6 | 16.7% | 0.0% | 83.3% | 0.0% |
| 9 | 4 | 50.0% | 0.0% | 50.0% | 0.0% |
| 10 | 2 | 0.0% | 0.0% | 50.0% | 50.0% |
§ 101 Yearly Trend
2019: PEG
2024: AI Examples
2025: Aug. Memo
Each bar shows the share of this examiner's observed office actions in that year that included a § 101 rejection.