US3574790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polystyrene composition of suppressed electrostatic accumulation tendencies
Assignee: Sinclair Research Inc
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Filing: 1967-12-07
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Granted: 1971-04-13
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Expires: 1987-12-07
Abstract
Abstract A POLYSTYRENE COMPOSITION IN WHICH ELECTROASTIC CHARGES ARE SUPPRESSED WHICH COMPRISES POLYSTYRENE AND AN AMOUNT, SUFFICIENT OF SUPPRESS THE ACCUMULATION OF ELECTROSTATIC CHARGES, E.G. ABOUT 0.05 TO 0.5 WT. PRECENT, BASED ON THE POLYSTYRENE, OF A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE HAVING A RATIO OF STYRENE TO MALEIC ANHYDRIDE OF ABOUT 1 TO 4:1 AND A MOLECULAR WEIGHT OF ABOUT 700 TO 8,000.
Inventors
- 👤 David W Young
- 👤 Henry V Isaacson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:12
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L35/00; C08L35/06; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |