Examiner Douglas J. Duff
Grant ratio: 66.7% (33rd percentile in Art Unit 3748 among examiners with at least 20 applications). Average office actions per grant: 2.24. Most common rejection type: §103.
Appears inactive
Last office action in data: October 2010
Examiner record
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| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 45 | 69.8% | 1.72 |
| Group | 444 | 57.6% | 1.86 |
| Tech Center | 2,671 | 48.4% | 2.01 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 0 | 0.0% |
| 1 OA | 42 | 36.8% |
| 2 OAs | 43 | 37.7% |
| 3 OAs | 18 | 15.8% |
| 4 OAs | 9 | 7.9% |
| 5+ OAs | 2 | 1.8% |
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 |
|---|---|---|---|
| 2008 | 32 | 17 | 53.1% |
| 2009 | 46 | 33 | 71.7% |
| 2010 | 36 | 26 | 72.2% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 114 | 0.0% | 28.1% | 71.1% | 0.0% |
| Action 2 | 72 | 0.0% | 27.8% | 70.8% | 1.4% |
| Action 3 | 29 | 0.0% | 27.6% | 72.4% | 0.0% |
| Action 4 | 11 | 0.0% | 18.2% | 81.8% | 0.0% |
| Action 5 | 2 | 0.0% | 50.0% | 50.0% | 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%
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.