US2447805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite resinous sheet of birefringent material and method of making the same
Assignee: Polaroid Corp
•
Filing: 1945-04-11
•
Granted: 1948-08-24
•
Expires: 1965-04-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Mark Hyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:39
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3008; C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1886234A
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US2123902A
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US2233442A
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US2328219A
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US2306222A
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US2346247A
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US2352085A
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US2378476A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |