US3474072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate-carbamates
Assignee: PPG Industries Inc
•
Filing: 1967-04-05
•
Granted: 1969-10-21
•
Expires: 1987-04-05
Abstract
No abstract record available.
Inventors
- 👤 William E Bissinger
- 👤 Franklin Strain
- 👤 Henry C Stevens
- 👤 William R Dial
- 👤 Raymond S Chisholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:55
CPC Classifications
C; C08; C08G; C08G64/00; C08L; C08L75/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3251803A
Cited
US3215668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |