US2799667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of linear polyesters
Assignee: Acordis UK Ltd
•
Filing: 1952-08-05
•
Granted: 1957-07-16
•
Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Drewitt James Gordon Napier
- 👤 Lincoln James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G63/78; C08G63/82; C08G63/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
PROCESS FOR THE PRODUCTION OF POLYESTERS, WHICH COMPRISES CONDENSING A FREE DICARBOXYLIC ACID WITH A CYCLIC GLYCOL CARBONATE UNTIL A POLYMER ISPRODUCED.
Claim 2
Dependent Claim
22 words
PROCESS FOR THE PRODUCTION OF POLYESTERS, WHICH COMPRISES CONDENSING A FREE DICARBOXYLIC ACID WITH A CYCLIC GLYCOL CARBONATE UNTIL A POLYMER ISPRODUCED.
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) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |