US2812420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash unit
Assignee: Polaroid Corp
•
Filing: 1953-11-10
•
Granted: 1957-11-05
•
Expires: 1973-11-10
Abstract
No abstract record available.
Inventors
- 👤 Herbert A Bing
- 👤 Jr James E Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:12
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2277233A
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US2565492A
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US2443163A
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US2496680A
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US2646672A
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US2624831A
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US2638764A
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GB696921A
Cited
US2727135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |