Patent US3531351A successfully refreshed from Google Patents.
US3531351A
Expired / Lapsed
US
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Preparation of light-polarizing film
Assignee: Polaroid Corp
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Filing: 1967-05-01
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Granted: 1970-09-29
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Expires: 1987-05-01
Abstract
No abstract record available.
Inventors
- 👤 Harold O Buzzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:21
CPC Classifications
B; B32; B32B; B32B27/00; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; G03; G03C; G03C9/00; G03C9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2274706A
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US2487063A
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US2524286A
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US2527400A
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US3130113A
Cited
US2892383A
Cited
US3015989A
Cited
US2996956A
Cited
US3058393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |