US2879037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill bit
Assignee: Individual
•
Filing: 1955-06-10
•
Granted: 1959-03-24
•
Expires: 1975-06-10
Abstract
No abstract record available.
Inventors
- 👤 Norman E Wolfram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:31
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US893596A
Cited
US2032328A
Cited
US2262001A
Cited
US2597301A
Cited
US2604305A
Cited
US2648524A
Cited
US2689108A
Cited
US2767958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |