US2911909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Droppable back-off tool
Assignee: EMILY B WILCOX
•
Filing: 1955-10-21
•
Granted: 1959-11-10
•
Expires: 1975-10-21
Abstract
No abstract record available.
Inventors
- 👤 Benjamin H Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:37
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/1075; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815; Y10T29/49822
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1623475A
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US2427377A
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US2595615A
Cited
US2745345A
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US2620029A
Cited
US2705920A
Cited
US2621895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |