Examiner Christopher F Callahan
Examiner Christopher F Callahan appears to be very easy relative to their art unit, group, tech center, and USPTO peers. Their lifetime grant ratio is 70.3%, they average 1.53 office actions per granted patent, and their rejection profile is dominated by ยง103.
Difficulty vs AU
Very Easy
Difficulty vs Group
Very Easy
Difficulty vs TC
Very Easy
Difficulty vs USPTO
Very Easy
Average OA / Grant
1.53
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Examiner Details
- Observed Examiner Years
- 7 years (2020-2026)
- Phone
- (571) 272-5847
- Predicted Supervisor
- Christine Mills
- Supervisor Phone
- (571) 272-8322
- Tech Center
- 3600 - Transportation, Electronic Commerce, Construction, Agriculture, Licensing and Review
- Group
- 3670 - Wells, Earth Boring/Moving, Mining, Harvesters, Bridges, Roads, Petroleum
Metrics
- Applications Evaluated
- 165
- Granted Applications
- 116
- Non-Granted Applications
- 49
- Avg OA / Grant
- 1.53
- Last OA Observed
- March 2026 (3 months ago)
- Art Units Seen
- 3675
Context Comparison
| Scope | Examiners | Lifetime Grant Ratio | Avg OA / Grant |
|---|---|---|---|
| This Examiner | 1 | 70.3% | 1.53 |
| Art Unit | 25 | 59.1% | 2.10 |
| Group | 235 | 60.7% | 1.84 |
| Tech Center | 2,337 | 48.0% | 2.11 |
| USPTO | 16,116 | 54.8% | 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 2020; examiner may not yet have been active in the available dataset. | |||
| 2020 | 3 | 3 | 100.0% |
| 2021 | 28 | 20 | 71.4% |
| 2022 | 33 | 26 | 78.8% |
| 2023 | 29 | 26 | 89.7% |
| 2024 | 30 | 24 | 80.0% |
| 2025 | 34 | 17 | 50.0% |
| 2026 | 8 | 0 | 0.0% |
116 family-cache-validated grants; 0 OA-only grant signals.
Rejection Timeline
| OA # | Office Actions | § 101 Percentage | § 102 Percentage | § 103 Percentage | § 112 Percentage |
|---|---|---|---|---|---|
| 1 | 161 | 0.0% | 13.0% | 69.6% | 16.1% |
| 2 | 58 | 0.0% | 20.7% | 74.1% | 5.2% |
| 3 | 15 | 0.0% | 0.0% | 93.3% | 6.7% |
| 4 | 5 | 0.0% | 0.0% | 80.0% | 20.0% |
| 5 | 2 | 0.0% | 0.0% | 100.0% | 0.0% |
| 6 | 1 | 0.0% | 0.0% | 100.0% | 0.0% |