Examiner Guozhen Liu
Grant ratio: 30.0% (94th percentile in Art Unit 1686 among examiners with at least 20 applications). Average office actions per grant: 2.50. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 96504
- Primary art unit
- 1686
- Work group
- 1680
- Technology center
- 1600
- Applications
- 140
- Granted applications
- 42
- Examiner phone
- (571) 272-0224
- Supervisor
- Larry D Riggs
- Supervisor phone
- (571) 270-3062
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 12 | 6.8% | 2.59 |
| Group | 68 | 6.4% | 2.37 |
| 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 | 10 | 7.1% |
| 1 OA | 36 | 25.7% |
| 2 OAs | 32 | 22.9% |
| 3 OAs | 22 | 15.7% |
| 4 OAs | 18 | 12.9% |
| 5+ OAs | 22 | 15.7% |
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 |
|---|---|---|---|
| 2022 | 15 | 9 | 60.0% |
| 2023 | 37 | 24 | 64.9% |
| 2024 | 21 | 7 | 33.3% |
| 2025 | 24 | 2 | 8.3% |
| 2026 | 43 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 130 | 12.3% | 6.2% | 63.8% | 1.5% |
| Action 2 | 94 | 34.0% | 3.2% | 47.9% | 3.2% |
| Action 3 | 62 | 43.5% | 0.0% | 48.4% | 6.5% |
| Action 4 | 40 | 60.0% | 0.0% | 32.5% | 2.5% |
| Action 5 | 22 | 54.5% | 0.0% | 45.5% | 0.0% |
| Action 6 | 12 | 66.7% | 0.0% | 41.7% | 8.3% |
| Action 7 | 5 | 80.0% | 0.0% | 20.0% | 0.0% |
| Action 8 | 1 | 100.0% | 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%
14.1%
36.6%
2024: AI examples
31.6%
2025: August memo
50.0%
34.5%
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.