US3576904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of organosiloxane gums and block copolymers of polyvinyl aromatics and polydimethylsiloxanes
Assignee: Dow Silicones Corp
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Filing: 1969-03-10
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Granted: 1971-04-27
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Expires: 1989-03-10
Abstract
Abstract BLENDS OF ORGANOSILOXANE GUMS AND A BLOCK COPOLYMER OF TWO BLOCKS WHERE ONE BLOCK IS A VINYL AROMATIC POLYMER AND THE OTHER BLOCK IS POLYDIMETHYLSILOXANE ARE DISCLOSED. THE BLOCK COPOLYMERS ARE PRESENT IN AMOUNTS OF 15 TO 150 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE ORGANOSILOXANE GUM. THESE BLENDS WHEN CURED TO ELASTOMERS HAVE IMPROVED PHYSICAL PROPERTIES OVER THE CURED UNFILLED ORGANOSILOXANE GUMS. THESE BLENDS CURE TO USEFUL ELASTOMERS.
Inventors
- 👤 John C Saam
- 👤 Charles W Lentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L83/10; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/24; C08G77/48; C08G77/50; C08G77/52; C08G77/70; Y; Y10; Y10S; Y10S525/00; Y10S525/925
Claims Analysis
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |