Patent US3637554A successfully refreshed from Google Patents.
US3637554A
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Polystyrene compositions
Assignee: Phillips Petroleum Co
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Filing: 1966-11-07
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Granted: 1972-01-25
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Expires: 1986-11-07
Abstract
Abstract PREPARATION OF POLYSTYRENE COMPOSITIONS OF IMPROVED IMPACT STRENGTH, TENSILE STRENGTH, AND ELONGATION BY BLENDING WITH POLYSTYRENE ONE OR MORE BRANCHED RADIAL BLOCK COPOLYMERS.
Inventors
- 👤 Clifford W Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:34
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C08L51/00; C08L51/04; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 0
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |