US2762789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters
Assignee: Celanese Corp
•
Filing: 1952-04-09
•
Granted: 1956-09-11
•
Expires: 1972-04-09
Abstract
No abstract record available.
Inventors
- 👤 Fisher James Wotherspoon
- 👤 Lincoln James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A LINEAR POLYESTER WHICH IS THE CONDENSATION PRODUCT OF AN AROMATIC DICARBOXYLIC ACID AND A BIS-(B-HYDROXYETHOXY) AROMATIC COMPOUND WHOSE TWO HYDROXYETHOXY GROUPS ARE JOINED TO EACH OTHER SOLELY THROUGH NUCLEAR AROMATIC CARBON ATOMS, THE TWO COMPONENTS HAVING THEIR RESPECTIVE CARBOXY AND HYDROXYETHOXY GROUPS LINKED DIRECTLY TO AN AROMATIC NUCLEAR WITH AT LEAST FOUR NUCLEAR CARBON ATOMS IN EACH AROMATIC NUCLEAR BETWEEN THE LINKAGES.
Claim 2
Dependent Claim
63 words
A LINEAR POLYESTER WHICH IS THE CONDENSATION PRODUCT OF AN AROMATIC DICARBOXYLIC ACID AND A BIS-(B-HYDROXYETHOXY) AROMATIC COMPOUND WHOSE TWO HYDROXYETHOXY GROUPS ARE JOINED TO EACH OTHER SOLELY THROUGH NUCLEAR AROMATIC CARBON ATOMS, THE TWO COMPONENTS HAVING THEIR RESPECTIVE CARBOXY AND HYDROXYETHOXY GROUPS LINKED DIRECTLY TO AN AROMATIC NUCLEAR WITH AT LEAST FOUR NUCLEAR CARBON ATOMS IN EACH AROMATIC NUCLEAR BETWEEN THE LINKAGES.
References Cited (Backward Citations)
US2437046A
Cited
US2593411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |