IPLA – International Patent Legal Administration
OPET – Office of Petitions
Generally available
| Petition type | Average days pending of decided petitions | Median days pending of decided petitions | Grant rate percentage | Deciding office | ePetition option |
|---|---|---|---|---|---|
| 283 - Unintentional delay priority claim (37 CFR 1.78(a)(3) & (a)(6) and 37 CFR 1.55 (c)) | 778 | 55 | 54% | IPLA | |
| 293 - Unintentional delay claiming benefit/priority add'l info | 61 | 41 | 54% | ||
| 507 - Late filing of priority papers (37 CFR 1.55(f)) | 140 | 147 | 32% | OPET | |
| 535 - To accept unintentionally delayed domestic benefit (37 CFR 1.78) or foreign priority (37 CFR 1.55)/claims, no additional information required | 70 | 66 | 56% | OPET | |
| 565 - To accept unintentionally delayed domestic benefit (37 CFR 1.78) or foreign priority (37 CFR 1.55) claims, additional information required | 57 | 55 | 42% | OPET | |
| 125 | 133 | 80% | OPET |
*Infrequently filed petition
Displayed are the 12-month rolling average and median values. When the median value is significantly different from the average value, the median value will better represent when a particular category of a petition has been decided. This is because a small number of outliers can disproportionately impact the average value. The values exclude ePetitions.
The data is current as of October 1, 2026, and is updated quarterly.