US2236944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1939-06-20
•
Granted: 1941-04-01
•
Expires: 1959-06-20
Abstract
No abstract record available.
Inventors
- 👤 Charles B Gerardi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:19
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0018; B23B51/0045; Y; Y10; Y10T; Y10T408/00; Y10T408/34; Y10T408/352; Y10T408/60; Y10T408/62; Y10T408/83; Y10T408/85; Y10T408/858; Y10T408/8588; Y10T408/85884
Claims Analysis
Total Claims: 0
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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) | 1944-03-31 | 1944-09-30 | 1945-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-31 | 1948-09-30 | 1949-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-31 | 1952-09-30 | 1953-04-01 | $7700.00 | Window Closed / Lapsed |