Patent US2554850A successfully refreshed from Google Patents.
US2554850A
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Heat resistant light-polarizing polyvinyl borate film containing borax
Assignee: Polaroid Corp
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Filing: 1948-06-18
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Granted: 1951-05-29
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Expires: 1968-06-18
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Binda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:22
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; Y; Y10; Y10S; Y10S428/00; Y10S428/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A LIGHT POLARIZER COMPRISING A MOLECULARLY ORIENTED SHEET OF A POLYVINYL COMPOUND FROM THE CLASS CONSISTING OF THE POLYVINYL ALCOHOLS, POLYVINYL ACETALS AND POLYVINYL KETALS, SAID SHEET CONTAINING, ADJACENT AT LEAST ONE SURFACE THEREOF, A SUBSTANCE FROM THE CLASS CONSISTING OF THE SODIUM AND POTASSIUM BORATES, THE SAID PORTION OF SAID SHEET COMPRISING ESSENTIALLY A HEAT- AND MOISTURE-RESISTANT COMPLEX OF BORIC ACID, SAID BORATE AND SAID POLYVINYL COMPOUND AND HAVING INCORPORATED THEREIN A MOLECULARLY ORIENTED DICHROIC, TRANSPARENT SORPTION COMPLEX OF IODINE, THE PRESENCE IN SAID SHEET OF SAID BORATE AND THE SAID COMPLEX THEREOF IMPROVING THE STABILITY OF SAID SHEET TO PROTRACTED EXPOSURE TO HIGH TEMPERATURES.
Claim 2
Dependent Claim
106 words
A LIGHT POLARIZER COMPRISING A MOLECULARLY ORIENTED SHEET OF A POLYVINYL COMPOUND FROM THE CLASS CONSISTING OF THE POLYVINYL ALCOHOLS, POLYVINYL ACETALS AND POLYVINYL KETALS, SAID SHEET CONTAINING, ADJACENT AT LEAST ONE SURFACE THEREOF, A SUBSTANCE FROM THE CLASS CONSISTING OF THE SODIUM AND POTASSIUM BORATES, THE SAID PORTION OF SAID SHEET COMPRISING ESSENTIALLY A HEAT- AND MOISTURE-RESISTANT COMPLEX OF BORIC ACID, SAID BORATE AND SAID POLYVINYL COMPOUND AND HAVING INCORPORATED THEREIN A MOLECULARLY ORIENTED DICHROIC, TRANSPARENT SORPTION COMPLEX OF IODINE, THE PRESENCE IN SAID SHEET OF SAID BORATE AND THE SAID COMPLEX THEREOF IMPROVING THE STABILITY OF SAID SHEET TO PROTRACTED EXPOSURE TO HIGH TEMPERATURES.
References Cited (Backward Citations)
US2072302A
Cited
US2162618A
Cited
US2173304A
Cited
US2237567A
Cited
US2326539A
Cited
US2444712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |