US2505084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-polarizing sheet of molecularly oriented polyvinyl alcohol containing reaction product of ferrous salt and a sulfide
Assignee: Polaroid Corp
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Filing: 1947-06-07
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Granted: 1950-04-25
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Expires: 1967-06-07
Abstract
No abstract record available.
Inventors
- 👤 Jr William F Amon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:00
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A SUBSTANTIALLY HAZE-FREE LIGHT-POLARIZING SHEET COMPRISING MOLECULARLY ORIENTED POLYVINYL ALCOHOL HAVING INCORPORATED THEREIN THE TRANSPARENT, HIGHLY DICHROIC, HEAT-STABLE, MOLECULARLY ORIENTED, WATER-INSOLUBLE PRODUCT COMPRISING POLYLVINYL ALCOHOL, SULFIDE IONS AND FERROUS IONS, WHICH IS THE CHEMICAL REACTION PRODUCT OF THE IMBIBITION INTO THE POLYVINYL ALCOHOL SHEET OF A RELATIVELY LOW CONCENTRATION OF A WATER- SOLUBLE FERROUS SALT AND AN EXCESS OVER THE STOICHIOMETRIC AMOUNT OF A WATER-SOLUBLE SULFIDE, THE DICHROISM OF SAID SHEET DERIVING ESSENTIALLY FROM SAID MOLECULARLY ORIENTED REACTION PRODUCT.
Claim 2
Dependent Claim
79 words
A SUBSTANTIALLY HAZE-FREE LIGHT-POLARIZING SHEET COMPRISING MOLECULARLY ORIENTED POLYVINYL ALCOHOL HAVING INCORPORATED THEREIN THE TRANSPARENT, HIGHLY DICHROIC, HEAT-STABLE, MOLECULARLY ORIENTED, WATER-INSOLUBLE PRODUCT COMPRISING POLYLVINYL ALCOHOL, SULFIDE IONS AND FERROUS IONS, WHICH IS THE CHEMICAL REACTION PRODUCT OF THE IMBIBITION INTO THE POLYVINYL ALCOHOL SHEET OF A RELATIVELY LOW CONCENTRATION OF A WATER- SOLUBLE FERROUS SALT AND AN EXCESS OVER THE STOICHIOMETRIC AMOUNT OF A WATER-SOLUBLE SULFIDE, THE DICHROISM OF SAID SHEET DERIVING ESSENTIALLY FROM SAID MOLECULARLY ORIENTED REACTION PRODUCT.
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) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |