Patent US4276465A successfully refreshed from Google Patents.
Patent US3215668A successfully refreshed from Google Patents.
US3215668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed carbonate-carbamate polyesters and process of making
Assignee: PPG Industries Inc
•
Filing: 1962-04-09
•
Granted: 1965-11-02
•
Expires: 1982-04-09
Abstract
No abstract record available.
Inventors
- 👤 William E Bissinger
- 👤 Strain Franklin
- 👤 Henry C Stevens
- 👤 William R Dial
- 👤 Raymond S Chisholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A MIXED CARBONATE-CARBAMATE POLYESTER OF (A) A BIS-PHENOL, (B) CARBONIC ACID, AND (C) A DIAMINE.
Claim 2
Dependent Claim
15 words
A MIXED CARBONATE-CARBAMATE POLYESTER OF (A) A BIS-PHENOL, (B) CARBONIC ACID, AND (C) A DIAMINE.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |