Patent US2445581A successfully refreshed from Google Patents.
US2445581A
Expired / Lapsed
US
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Treatment of polarizing polyvinyl alcohol-iodine sorption complex image with boric acid
Assignee: Polaroid Corp
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Filing: 1943-12-09
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Granted: 1948-07-20
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Expires: 1963-12-09
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:41
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)
US2072302A
Cited
US2077298A
Cited
US2108261A
Cited
US2162618A
Cited
GB497373A
Cited
US2206190A
Cited
US2230981A
Cited
US2162765A
Cited
US2172300A
Cited
GB526780A
Cited
US2165797A
Cited
GB549668A
Cited
US2304252A
Cited
US2286215A
Cited
US2237567A
Cited
US2173304A
Cited
US2263249A
Cited
US2299839A
Cited
US2326539A
Cited
US2289715A
Cited
US2289714A
Cited
US2313523A
Cited
US2310223A
Cited
US2311015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |