US4396642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolytically stabilized polarizer
Assignee: Optical Devices Inc
•
Filing: 1981-11-24
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Granted: 1983-08-02
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Expires: 2001-11-24
Abstract
Abstract A polarizer having increased hydrolytic stability is produced by impregnating a polyvinyl alcohol film with an iodine containing composition and then subjecting the substrate to both concentrated infrared and ultraviolet radiation treatments.
Inventors
- 👤 Lawrence Bolt
- 👤 Michael Smith
- 👤 Ali Tavasolian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; C08J2329/00; C08J2329/02; C08J2329/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A process for producing a hydrolytically stabilized polarizer which comprises staining a polyvinyl alcohol film in a bath of an iodine containing composition and subjecting said film to concentrated sources of infrared and ultraviolet radiation, each of said radiation treatments being conducted for a period of time less than about one minute and in amounts sufficient to substantially increase the hydrolytic stability of the film.
Claim 2
Dependent Claim
65 words
A process for producing a hydrolytically stabilized polarizer which comprises staining a polyvinyl alcohol film in a bath of an iodine containing composition and subjecting said film to concentrated sources of infrared and ultraviolet radiation, each of said radiation treatments being conducted for a period of time less than about one minute and in amounts sufficient to substantially increase the hydrolytic stability of the film.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said film is adhered to a support sheet either before or after said treatments.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said support sheet comprises a polyester.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said polyester support sheet comprises polyethylene terephthalate.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said polyethylene terephthalate has been uniaxially stretched.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said polyethylene terephthalate has been transversely uniaxially stretched.
Claim 8
Dependent Claim
13 words
The process of claim 2 wherein said support sheet comprises cellulose acetate butyrate.
Claim 9
Dependent Claim
16 words
The process of claim 2 wherein said polyvinyl alcohol film is laminated to said support sheet.
Claim 10
Dependent Claim
30 words
The process of claim 3 wherein said polyester support is coated with a composition comprising polyvinyl alcohol or polyurethane and said support is adhered to said film via said coating.
Claim 11
Dependent Claim
21 words
The process of claim 9 wherein an adhesion promoting agent is disposed between said polyvinyl alcohol film and said support sheet.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein said film is subjected to a boronic stabilizing treatment prior to irradiation.
Claim 13
Dependent Claim
13 words
The process of claim 1 wherein said film is dried prior to irradiation.
Claim 14
Dependent Claim
17 words
The process of claim 11 wherein said film is dried after boronic stabilizing but prior to irradiation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |