Patent US2591419A successfully refreshed from Google Patents.
US2591419A
Expired / Lapsed
US
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Flashlight with movable varicolored light filter
Assignee: Individual
•
Filing: 1949-08-05
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Granted: 1952-04-01
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Expires: 1969-08-05
Abstract
No abstract record available.
Inventors
- 👤 Nicholas D Gheorghiu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:05
CPC Classifications
F; F21; F21V; F21V9/00; F21L; F21L2/00; F21V17/00; F21V17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US723414A
Cited
US921560A
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US1279820A
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US1715884A
Cited
US1822619A
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US1978553A
Cited
US2126729A
Cited
US2270636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |