Patent US2934513A successfully refreshed from Google Patents.
US2934513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyesters
Assignee: Celanese Coatings Co
•
Filing: 1956-09-17
•
Granted: 1960-04-26
•
Expires: 1976-09-17
Abstract
No abstract record available.
Inventors
- 👤 Darrell D Hicks
- 👤 John E Masters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/56; C08G63/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC POLYESTERS WHICH COMPRISES CONCOMITANTLY REACTING, A MONOEPOXIDE, A DIHYDRIC PHENOL AND A DICARBOXYLIC ACID ANHYDRIDE AT AN ELEVATED TEMPERATURE BELOW WHICH WATER OF ESTERIFICATION IS FORMED, SAID DIHYDRIC PHENOL BEING SELECTED FROM THE GROUP CONSISTING OF MONONUCLEAR AND POLYNUCLEAR PHENOLS, SAID MONOEPOXIDE BEING SELECTED FROM THE GROUP CONSISTING OF OXIRANE, ALKYL OXIRANES, AND ETHERS AND ESTERS CONTAINING ONLY ONE THREE-MEMBERED EPOXIDE SUBSTITUENT, EACH FREE OF SUBSTITUENTS CAPABLE OF REACTING WITH AN ACID ANHYDRIDE GROUP, THE MOLAR RATIO OF DICARBOXYLIC ACID ANHYDRIDE TO MONOEPOXIDE BEING FROM N:N TO N:N+2 WHERE N REPRESENTS THE NUMBER OF MOLS OF ANHYDRIDE, AND THE MOLAR RATIO OF ANHYDRIDE PLUS MONOEPOXIDE TO DIHYDRIC PHENOL BEING GREATER THAN 4:1.
Claim 2
Dependent Claim
119 words
A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC POLYESTERS WHICH COMPRISES CONCOMITANTLY REACTING, A MONOEPOXIDE, A DIHYDRIC PHENOL AND A DICARBOXYLIC ACID ANHYDRIDE AT AN ELEVATED TEMPERATURE BELOW WHICH WATER OF ESTERIFICATION IS FORMED, SAID DIHYDRIC PHENOL BEING SELECTED FROM THE GROUP CONSISTING OF MONONUCLEAR AND POLYNUCLEAR PHENOLS, SAID MONOEPOXIDE BEING SELECTED FROM THE GROUP CONSISTING OF OXIRANE, ALKYL OXIRANES, AND ETHERS AND ESTERS CONTAINING ONLY ONE THREE-MEMBERED EPOXIDE SUBSTITUENT, EACH FREE OF SUBSTITUENTS CAPABLE OF REACTING WITH AN ACID ANHYDRIDE GROUP, THE MOLAR RATIO OF DICARBOXYLIC ACID ANHYDRIDE TO MONOEPOXIDE BEING FROM N:N TO N:N+2 WHERE N REPRESENTS THE NUMBER OF MOLS OF ANHYDRIDE, AND THE MOLAR RATIO OF ANHYDRIDE PLUS MONOEPOXIDE TO DIHYDRIC PHENOL BEING GREATER THAN 4:1.
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |