US2840538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resinous molding compositions and electrical conductor formed therewith
Assignee: Westinghouse Electric Corp
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Filing: 1955-04-12
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Granted: 1958-06-24
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Expires: 1975-04-12
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Minter
- 👤 Swiss Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:37
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A RESINOUS MOLDING COMPOSITION WHICH THERMOSETS TO A TOUGH AND ELASTIC SOLID COMPRISING AN INTIMATE ADMIXTURE OF (A) FROM 10 TO 70 PARTS BY WEIGHT OF A FINELY DIVIDED FILLER AT LEAST 70% BY WEIGHT OF WHICH IS A NONFIBROUS SOLID FILLER OF AN AVERAGE PARTICLE SIZE OF BELOW ONE MICRON AND (B) FROM 90 TO 30 PARTS BY WEIGHT OF A PLYESTER RESIN DERIVED BY HEATING ABOVE 150*C. BUT NOT EXCEEDING 250*C. (A) ONE MOL OF AT LEAST ONE UNSATURATED DICARBOXYLIC ACIDIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF FUMARIC ACID, MALEIC ACID, MALEIC ANHYDRIDE, CITRACONIC ANHYDRIDE, AND CITRACONIC ACID, (B) FROM 3 TO 5 MOLS OF ADIPIC ACID, (C) FROM 7 TO 9 MOLS OF SUCCINIC ACID, (D) FROM 0.5 TO 5 MOLS OF PROPYLENE GLYCOL, AND (E) FROM 14 TO 9 MOLS OF ETHYLENE GLYCOL, THE GLYCOLS PROVIDING SUFFICIENT HYDROXYL GROUPS TO EXCEED BY AT LEAST 5% BUT NOT OVER 15% THE NUMBER OF CARBOXYL GROUPS IN THE ACIDIC COMPOUNDS.
Claim 2
Dependent Claim
163 words
A RESINOUS MOLDING COMPOSITION WHICH THERMOSETS TO A TOUGH AND ELASTIC SOLID COMPRISING AN INTIMATE ADMIXTURE OF (A) FROM 10 TO 70 PARTS BY WEIGHT OF A FINELY DIVIDED FILLER AT LEAST 70% BY WEIGHT OF WHICH IS A NONFIBROUS SOLID FILLER OF AN AVERAGE PARTICLE SIZE OF BELOW ONE MICRON AND (B) FROM 90 TO 30 PARTS BY WEIGHT OF A PLYESTER RESIN DERIVED BY HEATING ABOVE 150*C. BUT NOT EXCEEDING 250*C. (A) ONE MOL OF AT LEAST ONE UNSATURATED DICARBOXYLIC ACIDIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF FUMARIC ACID, MALEIC ACID, MALEIC ANHYDRIDE, CITRACONIC ANHYDRIDE, AND CITRACONIC ACID, (B) FROM 3 TO 5 MOLS OF ADIPIC ACID, (C) FROM 7 TO 9 MOLS OF SUCCINIC ACID, (D) FROM 0.5 TO 5 MOLS OF PROPYLENE GLYCOL, AND (E) FROM 14 TO 9 MOLS OF ETHYLENE GLYCOL, THE GLYCOLS PROVIDING SUFFICIENT HYDROXYL GROUPS TO EXCEED BY AT LEAST 5% BUT NOT OVER 15% THE NUMBER OF CARBOXYL GROUPS IN THE ACIDIC COMPOUNDS.
References Cited (Backward Citations)
US2388319A
Cited
US2743309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |