Patent US2961427A successfully refreshed from Google Patents.
US2961427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyesters and process of making same
Assignee: Monsanto Chemicals Ltd
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Filing: 1958-01-02
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Granted: 1960-11-22
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Expires: 1978-01-02
Abstract
No abstract record available.
Inventors
- 👤 Henry A Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/005; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/199; C08G63/52; C08G63/54; C08G63/547
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PREPARING A LINEAR POLYESTER RESIN WHICH COMPRISES REACTING A DIHYDROXY COMPOUND WITH AN ANHYDRIDE AT 135-250*C., SAID DIHYDROXY COMPOUND BEING A MEMBER OF THE GROUP CONSISTING OF BIS (P-HYDROXYPHENYL) METHANE, 1,1-BIS (P-HYDROXYPHENYL) ETHAND, 2,2-BIS (P-HYDROXYPHENYL) PROPANE, 2,2-BIS (P-HYDROXYPHENYL) OCTANE, 1,1-BIS (P-HYDROXYPHENYL) CYCLOHEXANE, BIS (P-HYDROXYPHENYL) PHENYLMETHANE, BIS (PHYDROXYPHENYL) METHYLPHENYLMETHANE, 2,2-BIS (4-HYDROXYCYCLOHEXYL) PROPANE, AND 2,2-BIS (2,3,5,6-TETRACHLORO-4-HYDROXYPHENYL) PROPANE, SAID ANHYDRODE BEING A MIXED ANHYDRIDE OF A SATURATED ALIPHATIC MONOCARBOXYLIC ACID, CONTAINING 2-4 CARBON ATOMS AND A DICARBOXYLIC ACID OF THE GROUP CONSISTING OF FUMARIC, SEBACIC, SUBERIC, PIMELIC, ADIPIC, GLUTARIC, SUCCINIC, MALONIC, AND OXALIC ACIDS, SAID MIXED ANHYDRIDE CONTAINING TWO MONOCARBOXYLIC ACID MOIETIES AND ONE DICARBOXYLIC ACID MOIETY.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PREPARING A LINEAR POLYESTER RESIN WHICH COMPRISES REACTING A DIHYDROXY COMPOUND WITH AN ANHYDRIDE AT 135-250*C., SAID DIHYDROXY COMPOUND BEING A MEMBER OF THE GROUP CONSISTING OF BIS (P-HYDROXYPHENYL) METHANE, 1,1-BIS (P-HYDROXYPHENYL) ETHAND, 2,2-BIS (P-HYDROXYPHENYL) PROPANE, 2,2-BIS (P-HYDROXYPHENYL) OCTANE, 1,1-BIS (P-HYDROXYPHENYL) CYCLOHEXANE, BIS (P-HYDROXYPHENYL) PHENYLMETHANE, BIS (PHYDROXYPHENYL) METHYLPHENYLMETHANE, 2,2-BIS (4-HYDROXYCYCLOHEXYL) PROPANE, AND 2,2-BIS (2,3,5,6-TETRACHLORO-4-HYDROXYPHENYL) PROPANE, SAID ANHYDRODE BEING A MIXED ANHYDRIDE OF A SATURATED ALIPHATIC MONOCARBOXYLIC ACID, CONTAINING 2-4 CARBON ATOMS AND A DICARBOXYLIC ACID OF THE GROUP CONSISTING OF FUMARIC, SEBACIC, SUBERIC, PIMELIC, ADIPIC, GLUTARIC, SUCCINIC, MALONIC, AND OXALIC ACIDS, SAID MIXED ANHYDRIDE CONTAINING TWO MONOCARBOXYLIC ACID MOIETIES AND ONE DICARBOXYLIC ACID MOIETY.
References Cited (Backward Citations)
US2595343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |