US4153526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated windshield with improved innerlayer
Assignee: PPG Industries Inc
•
Filing: 1978-03-03
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Granted: 1979-05-08
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Expires: 1998-03-03
Abstract
Abstract Safety glass is made by laminating to a ply of glass a saturated polyvinyl acetal film incorporating a photoinitiator. The exposed surface of the film is irradiated with ultraviolet light which activates the photoinitiator which in turn initiates crosslinking of the polymer. The polymer film retains its desirable mechanical and optical properties while the crosslinked surface has improved solvent-abrasion resistance.
Inventors
- 👤 Joseph Cherenko
- 👤 Charles W. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:22
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/10706; B32B17/10761; B32B17/1077; C; C09; C09J; C09J129/00; C09J129/14; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/554; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0831; B32B2605/00; B32B2605/006; C08; C08L; C08L2666/00; C08L2666/28; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
A transparent polymer film for use as an innerlayer in a bilayer safety glass laminate which consists essentially of a saturated thermoplastic polyvinyl acetal and an effective amount of a photoinitiator capable of initiating crosslinking of said film upon exposure to actinic radiation.
Claim 2
Dependent Claim
43 words
A transparent polymer film for use as an innerlayer in a bilayer safety glass laminate which consists essentially of a saturated thermoplastic polyvinyl acetal and an effective amount of a photoinitiator capable of initiating crosslinking of said film upon exposure to actinic radiation.
Claim 3
Dependent Claim
27 words
A film as described in claim 1, wherein the photoinitiator is selected from the group consisting of benzophenone, xanthone, acetophenone, anthraquinone, 2[2'-hydroxy 5'-methylphenyl] benzotriazole, anthrone, and butanedione.
Claim 4
Dependent Claim
12 words
A film as described in claim 2, wherein said photoinitiator is benzophenone.
Claim 5
Dependent Claim
12 words
A film as described in claim 2, wherein said photoinitiator is xanthone.
References Cited (Backward Citations)
US2484529A
Cited
US2929710A
Cited
US3219566A
Cited
US3214492A
Cited
US3518175A
Cited
US3891171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |