US5344513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing laminated transparent substrate having birefringence
Assignee: Stanley Electric Co Ltd
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Filing: 1993-06-01
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Granted: 1994-09-06
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Expires: 2013-06-01
Abstract
Abstract A method of manufacturing a laminated transparent substrate comprising the steps of sandwiching between transparent glass substrates ionomer resin formed by bridging ethylenemetacryl acid copolymars with sodium ions, to form a laminated structure and sealing it in a reduced pressure atmosphere; applying heat and pressure to said laminated structure; rapidly decreasing the pressure applied to said laminated structure; and then rapidly decreasing the temperature of said laminated structure.
Inventors
- 👤 Shunji Takenaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:01
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/1099; B32B17/10009; B32B17/10036; B32B17/1055; B32B17/10743; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10853
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A method of manufacturing an optical compensator having a negative anisotropy comprising the successive steps of: (a) sandwiching between a pair of transparent substrates an ionomer resin, to form an optical compensator having a negative anisotropy and sealing it in a reduced pressure atmosphere; (b) applying heat to and increasing the pressure on said optical compensator; (c) while maintaining said optical compensator at a high temperature rapidly decreasing the pressure applied to said optical compensator; and thereafter (d) quenching and rapidly decreasing the temperature of said optical compensator thereby providing negative anisotropy to said optical compensator.
Claim 2
Independent Claim
96 words
A method of manufacturing an optical compensator having a negative anisotropy comprising the successive steps of: (a) sandwiching between a pair of transparent substrates an ionomer resin, to form an optical compensator having a negative anisotropy and sealing it in a reduced pressure atmosphere; (b) applying heat to and increasing the pressure on said optical compensator; (c) while maintaining said optical compensator at a high temperature rapidly decreasing the pressure applied to said optical compensator; and thereafter (d) quenching and rapidly decreasing the temperature of said optical compensator thereby providing negative anisotropy to said optical compensator.
Claim 3
Dependent Claim
30 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 1, wherein said ionomer resin is formed by bridging ethylene metacryl acid copolymers with metal ions.
Claim 4
Dependent Claim
22 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 2, wherein said ionomer resin contains sodium ions.
Claim 5
Dependent Claim
32 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 1, wherein the heat and the increase in pressure applied to step (b) are conducted in an autoclave.
Claim 6
Dependent Claim
42 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 4, wherein the step of rapid quenching the optical compensator is achieved by removing the optical compensator from the autoclave and placing it in a low temperature furnace.
Claim 7
Dependent Claim
27 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 1, wherein step (b) raises the temperature of the substrate to 100-150° C.
Claim 8
Dependent Claim
24 words
The method of manufacturing an optical compensator having a negative anisotropy according to claim 1, wherein step (b) increases the pressure to 1-5 atms.
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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) | 1997-09-05 | 1998-03-07 | 1998-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-05 | 2002-03-07 | 2002-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-05 | 2006-03-07 | 2006-09-06 | $7700.00 | Window Closed / Lapsed |