US3251806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amide-containing polycarbonates
Assignee: Armstrong World Industries Inc
•
Filing: 1962-09-26
•
Granted: 1966-05-17
•
Expires: 1982-09-26
Abstract
No abstract record available.
Inventors
- 👤 John A Parker
- 👤 Butterworth Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:50
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A POLYCARBONATE CONTAINING AT LEAST 5 MOLE PERCENT OF THE FOLLOWING RADICAL
Claim 2
Dependent Claim
12 words
A POLYCARBONATE CONTAINING AT LEAST 5 MOLE PERCENT OF THE FOLLOWING RADICAL
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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |