US3764457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent impact resistant poly(carbonate-urethane)laminates
Assignee: PPG Industries Inc
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Filing: 1971-08-02
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Granted: 1973-10-09
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Expires: 1991-08-02
Abstract
Abstract LAMINATES FOR USE AS AUTOMOBILE WINDSHIELDS OR OTHER SAFTEY GLASS APPLICATIONS COMPRISING A POLYCARBONATE URETHANE AND ONE OR MORE SHEETS OF GLASS ARE PROVIDED. THE URETHANE IS PREFERABLY A THERMOPLASTIC MATERIAL FORMED FROM AN ALIPHATIC POLYCARBONATE, A CYCLOALIPHATIC DIISOCYANATE AND A MONOMERIC ALIPHATIC DIOL.
Inventors
- 👤 W Chang
- 👤 A Kaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10752; B32B17/1077; C08G18/65; C08G18/66; C08G18/6633; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |