US2441019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-polarizing suspension of oriented crystals of dibenzacridine periodide in cellulose acetate
Assignee: Polaroid Corp
•
Filing: 1943-12-16
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Granted: 1948-05-04
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Expires: 1963-12-16
Abstract
No abstract record available.
Inventors
- 👤 Georgian Vlasios
- 👤 Jr William F Amon
- 👤 Gofstein Raiph
- 👤 Edwin H Land
- 👤 Cutler D West
- 👤 Robert B Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1989371A
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US1956867A
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US2011553A
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US2123902A
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US2233941A
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US2168221A
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GB493175A
Cited
US2289712A
Cited
US2289713A
Cited
US2256403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |