US2779783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of linear polyesters of alkylene dicarboxylic acids
Assignee: Bridgestone Firestone Inc
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Filing: 1954-09-29
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Granted: 1957-01-29
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Expires: 1974-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert A Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:14
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G63/52; C08G63/56; C08G63/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
PROCESS WHICH COMPRISES REACTING TOGETHER, AT TEMPERATURES IN THE RANGE 30*-150*C., (A) A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF ANHYDRIDES OF ALKYLENE DICARBOXYLIC ACIDS CONTAINING FROM 4 TO 16 CARBON ATOMS AND MIXTURES THEREOF WITH ANHYDRIDES OF OTHER DICARBOXYLIC ACIDS, SAID MIXTURES CONTAINING AT LEAST 80% BY WEIGHT OF SAID ANHYDRIDES OF SAID ALKYLENE DICARBOXYLIC ACIDS WITH (B) AN ALKYLEN OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS, IN THE PRESENCE OF (C) FROM 0.5 TO 5.0%, BASED ON THE WEIGHT OF THE REACTION MIXTURE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, ALKALINE EARTH METAL AND ORGANIC AMMONIUM SALTS AND HYDROXIDES TOGETHER WITH AT LEAST 10% OF WATER BASED ON THE WEIGHT OF SAID SELECTED CATALYST.
Claim 2
Dependent Claim
121 words
PROCESS WHICH COMPRISES REACTING TOGETHER, AT TEMPERATURES IN THE RANGE 30*-150*C., (A) A SUBSTANCE SELECTED FROM THE CLASS CONSISTING OF ANHYDRIDES OF ALKYLENE DICARBOXYLIC ACIDS CONTAINING FROM 4 TO 16 CARBON ATOMS AND MIXTURES THEREOF WITH ANHYDRIDES OF OTHER DICARBOXYLIC ACIDS, SAID MIXTURES CONTAINING AT LEAST 80% BY WEIGHT OF SAID ANHYDRIDES OF SAID ALKYLENE DICARBOXYLIC ACIDS WITH (B) AN ALKYLEN OXIDE CONTAINING FROM 2 TO 4 CARBON ATOMS, IN THE PRESENCE OF (C) FROM 0.5 TO 5.0%, BASED ON THE WEIGHT OF THE REACTION MIXTURE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, ALKALINE EARTH METAL AND ORGANIC AMMONIUM SALTS AND HYDROXIDES TOGETHER WITH AT LEAST 10% OF WATER BASED ON THE WEIGHT OF SAID SELECTED CATALYST.
References Cited (Backward Citations)
GB500300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |