US2665369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof light having a pressure relieving porous element
Assignee: Wilmot Castle Co
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Filing: 1949-04-08
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Granted: 1954-01-05
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Expires: 1969-04-08
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Greppin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:55
CPC Classifications
F; F21; F21V; F21V17/00; F21V25/00; F21V25/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE275626C
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US321166A
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FR640249A
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US1985922A
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US2069950A
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US2280402A
Cited
US2295339A
Cited
US2447048A
Cited
US2530135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |