US2551731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters from heterocyclic components
Assignee: Celanese Corp
•
Filing: 1947-10-28
•
Granted: 1951-05-08
•
Expires: 1967-10-28
Abstract
No abstract record available.
Inventors
- 👤 Drewitt James Gordon Napier
- 👤 Lincoln James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G63/66; C08G63/668; C08G63/672; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
PROCESS FOR THE PRODUCTION OF POLYESTERS, WHICH COMPRISES HEATING TOGETHER UNTIL A POLYMER IS PRODUCED REAGENTS ONE OF WHICH IS SELECTED FROM THE GROUP CONSISTING OF DIOLS WHOSE HYDROXY GROUPS ARE THEIR SOLE REACTIVE GROUPS AND THEIR ESTER-FORMING DERIVATIVES AND WHICH IS PRESENT IN PROPORTION OF MORE THAN ONE MOLE TO EACH MOLE OF THE OTHER REAGENT WHICH IS SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS WHOSE CARBOXYLIC GROUPS ARE THEIR SOLE REACTIVE GROUPS AND THEIR ESTER-FORMING DERIVATIVES, THE DICARBOXYLIC ACID HAVING BOTH IS CARBOXYLIC GROUPS DIRECTLY ATTACHED TO A HETEROCYCLIC RING WITH CONJUGATED UNSATURATION AND HAVING ITS DIMETHYL ESTER MELTING AT ABOVE 100* C.
Claim 2
Dependent Claim
106 words
PROCESS FOR THE PRODUCTION OF POLYESTERS, WHICH COMPRISES HEATING TOGETHER UNTIL A POLYMER IS PRODUCED REAGENTS ONE OF WHICH IS SELECTED FROM THE GROUP CONSISTING OF DIOLS WHOSE HYDROXY GROUPS ARE THEIR SOLE REACTIVE GROUPS AND THEIR ESTER-FORMING DERIVATIVES AND WHICH IS PRESENT IN PROPORTION OF MORE THAN ONE MOLE TO EACH MOLE OF THE OTHER REAGENT WHICH IS SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS WHOSE CARBOXYLIC GROUPS ARE THEIR SOLE REACTIVE GROUPS AND THEIR ESTER-FORMING DERIVATIVES, THE DICARBOXYLIC ACID HAVING BOTH IS CARBOXYLIC GROUPS DIRECTLY ATTACHED TO A HETEROCYCLIC RING WITH CONJUGATED UNSATURATION AND HAVING ITS DIMETHYL ESTER MELTING AT ABOVE 100* C.
References Cited (Backward Citations)
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US2343808A
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US2274831A
Cited
US2327131A
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US2256381A
Cited
US2394010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |