US2912887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-double spiral drill
Assignee: Individual
•
Filing: 1958-03-17
•
Granted: 1959-11-17
•
Expires: 1978-03-17
Abstract
No abstract record available.
Inventors
- 👤 Rudolf W Andreasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/06; Y; Y10; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2325973A
Cited
US2348874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |