US3451966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate-carbamates of alkylidene diphenols and dihydroxydiphenyl sulfones
Assignee: PPG Industries Inc
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Filing: 1966-11-08
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Granted: 1969-06-24
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Expires: 1986-11-08
Abstract
No abstract record available.
Inventors
- 👤 James T Gregory
- 👤 Arthur B Robertson
- 👤 William A Keim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:30
CPC Classifications
C; C08; C08G; C08G64/00; C08G63/00; C08G63/68; C08L; C08L75/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |