Patent US2779744A successfully refreshed from Google Patents.
US2779744A
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Polystyrene phonograph record composition and method of making same
Assignee: Union Carbide Corp
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Filing: 1952-10-21
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Granted: 1957-01-29
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Expires: 1972-10-21
Abstract
No abstract record available.
Inventors
- 👤 Groff Frazier
- 👤 Potter Peter Bredgman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/10; C08K3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A METHOD OF PREPARING A RESINOUS POLYSTYRENE COMPOSITION SUITABLE FOR MOLDING INTO SOUND RECORDS THE STEPS WHICH COMPRISE MILLING SHARP-EDGED PARTICLES OF A MEMBER OF THE GROUP OF MATERIALS CONSISTING OF SILICON CARBIDE AND BORON CARABIDE WITH A SMALL AMOUNT OF POLYSTYRENE RESIN SUFFICIENT TO HOLD THE PARTICLES TOGETHER AND ENABLE GRINDING OF PARTICLES AGAINST ONE ANOTHER UNTIL THE SHARP EDGES OF THE PARTICLES ARE DULLED AND THERAFTER MILLING IN AN ADDITIONAL AMOUNT OF POLYSTYRENE SUFFICIENT TO FORM A HOMOGENEOUS COMPOSITION CONTAINING UP TO ABOUT 3.5 PARTS BY WEIGHT OF SAID DULLED PARTICLES PER 100 PARTS BY WEIGHT POLYSTYRENE.
Claim 2
Dependent Claim
100 words
IN A METHOD OF PREPARING A RESINOUS POLYSTYRENE COMPOSITION SUITABLE FOR MOLDING INTO SOUND RECORDS THE STEPS WHICH COMPRISE MILLING SHARP-EDGED PARTICLES OF A MEMBER OF THE GROUP OF MATERIALS CONSISTING OF SILICON CARBIDE AND BORON CARABIDE WITH A SMALL AMOUNT OF POLYSTYRENE RESIN SUFFICIENT TO HOLD THE PARTICLES TOGETHER AND ENABLE GRINDING OF PARTICLES AGAINST ONE ANOTHER UNTIL THE SHARP EDGES OF THE PARTICLES ARE DULLED AND THERAFTER MILLING IN AN ADDITIONAL AMOUNT OF POLYSTYRENE SUFFICIENT TO FORM A HOMOGENEOUS COMPOSITION CONTAINING UP TO ABOUT 3.5 PARTS BY WEIGHT OF SAID DULLED PARTICLES PER 100 PARTS BY WEIGHT POLYSTYRENE.
References Cited (Backward Citations)
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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 |