Patent US2996956A successfully refreshed from Google Patents.
US2996956A
Expired / Lapsed
US
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Light-polarizing film material and the process of preparation
Assignee: Polaroid Corp
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Filing: 1958-03-27
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Granted: 1961-08-22
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Expires: 1978-03-27
Abstract
No abstract record available.
Inventors
- 👤 William H Ryan
- 👤 Howard C Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
G; G03; G03C; G03C9/00; G03C9/04; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; Y; Y10; Y10S; Y10S430/00; Y10S430/142
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |