US3297633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyesters with low melt viscosity from a mixture of bisphenol isomers
Assignee: —
•
Filing: —
•
Granted: 1967-01-10
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Expires: 1984-01-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:24
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G75/00; C08G75/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A LINEAR, HIGH MOLECULAR WEIGHT POLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A MIXTURE OF ISOMERS OF BIS(HYDROXYPHENYL)-METHANE CONTAINING AT LEAST TWENTY-FIVE WEIGHT PERCENT 2,4''-BIS(HYDROXYPHENYL)-METHANE, 4,4''BIS(HYDROXYPHENYL)-METHANE IN A MAXIMUM PROPORTION OF SEVENTY WEIGHT PERCENT, AND 2,2''-BIS(HYDROXYPHENYL)METHANE IN A MAXIMUM PROPORTION OF SEVENTY-FIVE WEIGHT PERCENT.
Claim 2
Dependent Claim
44 words
A LINEAR, HIGH MOLECULAR WEIGHT POLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A MIXTURE OF ISOMERS OF BIS(HYDROXYPHENYL)-METHANE CONTAINING AT LEAST TWENTY-FIVE WEIGHT PERCENT 2,4''-BIS(HYDROXYPHENYL)-METHANE, 4,4''BIS(HYDROXYPHENYL)-METHANE IN A MAXIMUM PROPORTION OF SEVENTY WEIGHT PERCENT, AND 2,2''-BIS(HYDROXYPHENYL)METHANE IN A MAXIMUM PROPORTION OF SEVENTY-FIVE WEIGHT PERCENT.
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |