Patent DE485250C successfully refreshed from Google Patents.
US2900972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater spear gun
Assignee: Individual
•
Filing: 1956-09-24
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Granted: 1959-08-25
•
Expires: 1976-09-24
Abstract
No abstract record available.
Inventors
- 👤 De Loss L Marsh
- 👤 Stanley C Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:38
CPC Classifications
F; F41; F41B; F41B11/00; F41B11/80; F41B11/83
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1073455A
Cited
US1204803A
Cited
FR909725A
Cited
US2546961A
Cited
US2723656A
Cited
US2725048A
Cited
US2784712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |