Patent US2733896A successfully refreshed from Google Patents.
US2733896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
gunning
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:47
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B15/00; E21B15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2044878A
Cited
US2123897A
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US2104341A
Cited
US2217674A
Cited
US2225324A
Cited
US2316672A
Cited
US2318595A
Cited
US2360318A
Cited
US2500931A
Cited
US2491273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |