US4226904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymethyl methacrylate-polyvinylidene fluoride laminates and method
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1978-11-27
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Granted: 1980-10-07
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Expires: 1998-11-27
Abstract
Abstract The present invention relates to a laminate comprising a polymethyl methacrylate layer having adheringly coated on at least one surface thereof a layer of polyvinylidene fluoride having a maximum thickness one-tenth the thickness of the polymethyl methacrylate layer; the total thickness of the polyvinylidene fluoride being no greater than about 400 microns. The invention also comprises the method of making such laminates.
Inventors
- 👤 Jean-Paul Ollivier
- 👤 Albert Strassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:18
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/043; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/308; B32B7/00; B32B7/04; B32B7/12; C08J7/0427; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12; C08J2427/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A laminate comprising a polymethyl methacrylate layer having coated on at least one surface thereof a layer of a polyvinylidene fluoride having a maximum thickness one-tenth of the thickness of the polymethyl methacrylate with the thickness of the polyvinylidene fluoride coating being no greater than 400 microns and an intermediate layer having the same optical properties as polymethyl methacrylate comprising a polymethyl methacrylate layer.
Claim 2
Dependent Claim
64 words
A laminate comprising a polymethyl methacrylate layer having coated on at least one surface thereof a layer of a polyvinylidene fluoride having a maximum thickness one-tenth of the thickness of the polymethyl methacrylate with the thickness of the polyvinylidene fluoride coating being no greater than 400 microns and an intermediate layer having the same optical properties as polymethyl methacrylate comprising a polymethyl methacrylate layer.
Claim 3
Dependent Claim
20 words
A laminate according to claim 1, wherein the thickness of the polyvinylidene fluoride layer is no greater than 100 microns.
Claim 4
Dependent Claim
30 words
A laminate according to claim 1, wherein the intermediate adhesive layer is a film of polymethyl methacrylate formed by drying a solution of polymethyl methacrylate in an aprotic polar solvent.
References Cited (Backward Citations)
GB1085818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |