US2645290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Junk basket
Assignee: Individual
•
Filing: 1949-09-23
•
Granted: 1953-07-14
•
Expires: 1969-09-23
Abstract
No abstract record available.
Inventors
- 👤 William W Fortenberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US156631A
Cited
US2054278A
Cited
US2124772A
Cited
US2159249A
Cited
US2181187A
Cited
US2169922A
Cited
US2416513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |