US3667996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxylated copolymers composed of monomethylsiloxane units and diphenylsiloxane units
Assignee: Dow Silicones Corp
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Filing: 1970-10-27
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Granted: 1972-06-06
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Expires: 1990-10-27
Abstract
Abstract HYDROXYLATED COPOLYMERS OF (C6H5)2SIO UNITS AND CH3SIO1.5 UNITS ARE DISCLOSED. THE DIPHENYLSILOXANE UNITS ARE PRESENT IN AN AMOUNT OF 20 TO 50 MOL PERCENT AND ARE BONDED TO MONOMETHYLSILOXANE UNITS WHICH CONTAIN THE HYDROXYL GROUPS. ALSO DISCLOSED ARE THE ABOVE HYDROXYLATED COPOLYMERS MODIFIED BY LINKING SEGMENTS OF -O-SI(-R2)-(O-SI(-R2))X-O-SI(-R2)-O- WHERE X IS AT LEAST 2 AND R IS METHYL,PHENYL OR 3,3,3,TRIFLUOROPROPYL AND THE SEGMENTS ARE PRESENT IN AMOUNTS OF 1 TO 50 WEIGHT PERCENT. THE HYDROXYLATED COPOLYMERS AND THE MODIFIED HYDROXYLATED COPOLYMEERS ARE RESINS USEFUL IN PROTECTIVE COATINGS, LAMINATES, RELEASE COATINGS AND MOLDING RESINS.
Inventors
- 👤 Robert C Antonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:23
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; Y; Y10; Y10S; Y10S528/00; Y10S528/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |