US2051525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill bit
Assignee: Globe Oil Tools Co
•
Filing: 1933-11-17
•
Granted: 1936-08-18
•
Expires: 1953-11-17
Abstract
No abstract record available.
Inventors
- 👤 John H Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:21
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; B; B28; B28D; B28D1/00; B28D1/14; B28D1/146; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/948; Y10T; Y10T279/00; Y10T279/17; Y10T279/17931; Y10T279/17941
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-08-18 | 1940-02-17 | 1940-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-18 | 1944-02-17 | 1944-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-18 | 1948-02-17 | 1948-08-18 | $7700.00 | Window Closed / Lapsed |