US3646161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic rubber mixtures of butadiene/styrene block copolymers
Assignee: Bayer AG
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Filing: 1969-05-08
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Granted: 1972-02-29
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Expires: 1989-05-08
Abstract
Abstract SYNETHIC RUBBER MIXTURE COMPRISING: (A) FROM 10% TO 90% BY WEIGHT OF ONE OR MORE UNIFORM BUTADIENE/STRENE BLOCK COPOLYMERS WITH A MOLECULAR WEITHT OF FROM 30,000 TO 150,000 , A VISCOSITY (N) MEASURED IN TOUENE OF FROM 0.5 TO 2 DL./G. AND A STRYENE CONTENT OF FROM 20% TO 50% BY WEIGHT; AND (B) FROM 90% TO 10% BY WEIGHT OF ONE OR MORE UNIFORM BUTADINE/STYRENE BLOCK COPOLYMERS WITH A MOLECULAR WEIGHT OF FROM 100,000 TO 1,000,000, A VISCOSITY (N) MEASURED IN TOLUENE OF FROM 1.5 TO 10 DL./G. AND A STYRENE CONTENT OF FROM 0.3 TO 20% BY WEIGHT.
Inventors
- 👤 Gunter Marwede
- 👤 Gottfried Pampus
- 👤 Martin Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:48
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08L; C08L53/00; C08L53/02
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |