US4564545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-polarizing plate having excellent durability and production of the same
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1984-02-29
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Granted: 1986-01-14
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Expires: 2004-02-29
Abstract
Abstract A light-polarizing plate for display use is improved in its humid, thermal and weather durabilities by controlling moisture content of a light-polarizing film made of polyvinylalcohol prior to be laminated with protector film and also by using as protector film a hydrophobic polymer film having low water vapor transmission.
Inventors
- 👤 Takuzo Okumura
- 👤 Masataka Yanase
- 👤 Hitoshi Kikui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/306; G; G02; G02B; G02B5/00; G02B5/30; B32B27/06; B32B27/08; B32B27/32; G02B5/3025; G02B5/3033; B32B2307/00; B32B2307/40; B32B2307/42; B32B2307/70; B32B2307/728; B32B2323/00; B32B2323/04; B32B2323/043; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31725; Y10T428/31739; Y10T428/31743
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A light-polarizing plate comprising a light polarizing film covered with a high polymer film protector, wherein said light polarizing film is made of uniaxially stretched polyvinyl alcohol or its derivative and has a moisture content of not more than 5% and said highpolymer film protector is made of high density polyethylene or polypropylene and is prepared by uniaxially stretching by means of pressure rolls and has an average light transmission in the visible region of not less than 30%, the water vapor transmission of the protector film being not more than 10 g/m 2 day.
Claim 2
Dependent Claim
95 words
A light-polarizing plate comprising a light polarizing film covered with a high polymer film protector, wherein said light polarizing film is made of uniaxially stretched polyvinyl alcohol or its derivative and has a moisture content of not more than 5% and said highpolymer film protector is made of high density polyethylene or polypropylene and is prepared by uniaxially stretching by means of pressure rolls and has an average light transmission in the visible region of not less than 30%, the water vapor transmission of the protector film being not more than 10 g/m 2 day.
Claim 3
Dependent Claim
23 words
A light-polarizing plate according to claim 1, wherein the polarizing film is made of polyvinylalcohol or its derivative stretched uniaxially by pressure rolls.
References Cited (Backward Citations)
US3075857A
Cited
US3244582A
Cited
FR2182164A1
Cited
GB1384791A
Cited
EP0000209A1
Cited
JPS5762011A
Cited
JPS5827107A
Cited
JPS58143305A
Cited
JPS6040545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |