Patent US2680844A successfully refreshed from Google Patents.
US2680844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens for flashlights and the like
Assignee: Individual
•
Filing: 1949-05-04
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Granted: 1954-06-08
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Expires: 1969-05-04
Abstract
No abstract record available.
Inventors
- 👤 Clayton H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:58
CPC Classifications
F; F21; F21L; F21L4/00; F21L4/005; G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0005; G02B6/0006; F21V; F21V2200/00; F21V2200/10; F21V2200/17
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) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |