US3403132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing copolyesters
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1957-06-21
•
Granted: 1968-09-24
•
Expires: 1977-06-21
Abstract
No abstract record available.
Inventors
- 👤 Richard C Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A METHOD OF MAKING A COPOLYESTER WHICH COMPRISES REACTING, WITH THE ELIMINATION OF ETHYLENE GLYCOL, A MIXTURE OF 100 MOLS OF BIS (B-HYDROXYETHYL)TEREPHTHALATE AND FROM 10 TO 70 MOLS OF 2,2-BIS (4-(B-HYDROXYETHOXY)PHENYL) PROPANE.
Claim 2
Independent Claim
33 words
A METHOD OF MAKING A COPOLYESTER WHICH COMPRISES REACTING, WITH THE ELIMINATION OF ETHYLENE GLYCOL, A MIXTURE OF 100 MOLS OF BIS (B-HYDROXYETHYL)TEREPHTHALATE AND FROM 10 TO 70 MOLS OF 2,2-BIS (4-(B-HYDROXYETHOXY)PHENYL) PROPANE.
References Cited (Backward Citations)
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GB678264A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |