US2598518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock bit
Assignee: Individual
•
Filing: 1948-04-21
•
Granted: 1952-05-27
•
Expires: 1968-04-21
Abstract
No abstract record available.
Inventors
- 👤 Normand E Dufilho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/16; E21B10/083; E21B10/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1238757A
Cited
US1254267A
Cited
US1254268A
Cited
US1139529A
Cited
US1334632A
Cited
US2027700A
Cited
US2124414A
Cited
US2221242A
Cited
US2248339A
Cited
US2365266A
Cited
US2362860A
Cited
US2336335A
Cited
US2336336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |