Examiner Richard K Durden
Examiner Richard K Durden appears to be about average relative to their peer examiners. Their lifetime grant ratio is 54.4%, they average 1.80 office actions per granted patent, and their rejection profile is dominated by ยง103.
Difficulty vs AU
Very Hard
Difficulty vs Group
About Average
Difficulty vs TC
Very Easy
Difficulty vs USPTO
Very Easy
Average OA / Grant
1.80
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Examiner Details
- Observed Examiner Years
- 12 years (2015-2026)
- Phone
- (571) 270-0538
- Predicted Supervisor
- N/A
- Supervisor Phone
- N/A
- Tech Center
- 3700 - Mechanical Engineering, Manufacturing and Products
- Group
- 3750 - Fluid Handling and Dispensing
Metrics
- Applications Evaluated
- 428
- Granted Applications
- 233
- Non-Granted Applications
- 195
- Avg OA / Grant
- 1.80
- Last OA Observed
- July 2026 (1 months ago)
- Art Units Seen
- 3753
- Work Groups Seen
Context Comparison
| Scope | Examiners | Lifetime Grant Ratio | Avg OA / Grant |
|---|---|---|---|
| This Examiner | 1 | 54.4% | 1.80 |
| Art Unit | 64 | 61.4% | 1.70 |
| Group | 162 | 53.7% | 1.75 |
| Tech Center | 2,662 | 48.9% | 2.01 |
| 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 2015; examiner may not yet have been active in the available dataset. | |||
| 2015 | 16 | 13 | 81.3% |
| 2016 | 38 | 31 | 81.6% |
| 2017 | 35 | 26 | 74.3% |
| 2018 | 30 | 15 | 50.0% |
| 2019 | 50 | 31 | 62.0% |
| 2020 | 42 | 29 | 69.0% |
| 2021 | 32 | 21 | 65.6% |
| 2022 | 49 | 26 | 53.1% |
| 2023 | 37 | 24 | 64.9% |
| 2024 | 29 | 12 | 41.4% |
| 2025 | 33 | 5 | 15.2% |
| 2026 | 37 | 0 | 0.0% |
233 family-cache-validated grants; 0 OA-only grant signals.
Rejection Timeline
| OA # | Office Actions | § 101 Percentage | § 102 Percentage | § 103 Percentage | § 112 Percentage |
|---|---|---|---|---|---|
| 1 | 433 | 0.0% | 7.2% | 79.4% | 12.7% |
| 2 | 221 | 0.0% | 7.2% | 70.1% | 22.2% |
| 3 | 108 | 0.0% | 5.6% | 78.7% | 15.7% |
| 4 | 61 | 0.0% | 3.3% | 78.7% | 18.0% |
| 5 | 17 | 0.0% | 0.0% | 88.2% | 11.8% |
| 6 | 3 | 0.0% | 0.0% | 100.0% | 0.0% |