US2589688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing linear polyesters
Assignee: Wingfoot Corp
•
Filing: 1946-07-16
•
Granted: 1952-03-18
•
Expires: 1966-07-16
Abstract
No abstract record available.
Inventors
- 👤 Paul J Flory
- 👤 Frederick S Leutner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A METHOD OF PREPARING A SUPERPOLYESTER WHICH COMPRISES REACTING, SOLELY BY CONDENSATION WITH THE ELIMINATION OF GASEOUS HYDROGEN CHLORIDE, A MIXTURE CONTAINING, AS THE SOLE REACTANTS, EQUIMOLECULAR PROPORTIONS OF (A) AT LEAST ONE GLYCOL IN WHICH THE SHORTEST CHAIN BETWEEN THE HYDROXYL GROUPS CONTAINS AT LEAST FOUR ATOMS AND WHICH HAS THE STRUCTURAL FORMULA
Claim 2
Independent Claim
54 words
A METHOD OF PREPARING A SUPERPOLYESTER WHICH COMPRISES REACTING, SOLELY BY CONDENSATION WITH THE ELIMINATION OF GASEOUS HYDROGEN CHLORIDE, A MIXTURE CONTAINING, AS THE SOLE REACTANTS, EQUIMOLECULAR PROPORTIONS OF (A) AT LEAST ONE GLYCOL IN WHICH THE SHORTEST CHAIN BETWEEN THE HYDROXYL GROUPS CONTAINS AT LEAST FOUR ATOMS AND WHICH HAS THE STRUCTURAL FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |