Patent US2642520A successfully refreshed from Google Patents.
US2642520A
Expired / Lapsed
US
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Portable rechargable flashlight
Assignee: Individual
•
Filing: 1946-12-21
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Granted: 1953-06-16
•
Expires: 1966-12-21
Abstract
No abstract record available.
Inventors
- 👤 Roger S Coolidge
- 👤 Harry W Keely
- 👤 Reginald S Smith
- 👤 Tore N Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:46
CPC Classifications
F; F21; F21L; F21L4/00; F21L4/08; F21L4/085; H; H02; H02J; H02J7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1034108A
Cited
US1230004A
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US1267199A
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US1506303A
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US1506302A
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US1528709A
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US1596131A
Cited
US1717563A
Cited
US1861789A
Cited
US2176479A
Cited
US2293284A
Cited
US2425743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |