Patent US2670308A successfully refreshed from Google Patents.
US2670308A
Expired / Lapsed
US
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Microgroove polystyrene phonograph record
Assignee: Union Carbide Corp
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Filing: 1950-04-27
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Granted: 1954-02-23
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Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Groff Frazier
- 👤 Howard D Bassett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:00
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/70; G11B3/705; G11B3/58
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
MICROGROOVE RECORD COMPRISING A PLAYING SURFACE OF POLYSTYRENE HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN 50,000 AND 80,000 AND LESS THAN 3% BY WEIGHT OF METHANOL SOLUBLE MATTER AND DISPERSED IN SAID POLYSTYRENE BETWEEN 2 AND 10% BY WEIGHT THEREOF OF NATURAL WAX, SAID RECORD HAVING A THIN COATING ON ITS PLAYING SURFACE COMPRISING A WATER-SOLUBLE AGENT SELECTED FROM THE GROUP CONSISTING OF GLYCEROL, POLYGLYCEROL AND POLYETHYLENE GLYCOLS, THE COATING IN THE RECORED GROOVES BEING BETWEEN ABOUT 0.0001 AND 0.0005 INCH THICKNESS.
References Cited (Backward Citations)
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US1887021A
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US2184524A
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US2393863A
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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) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |