US3418475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leaf spring-mounted shutter device activated by the interruption of electrical power
Assignee: CLAUDE R HUDGENS
•
Filing: 1965-08-19
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Granted: 1968-12-24
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Expires: 1985-08-19
Abstract
No abstract record available.
Inventors
- 👤 Claude R Hudgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:49
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/04; A; A61; A61B; A61B6/00; A61B6/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |