US3660434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane-containing epoxide compounds
Assignee: National Aeronautics and Space Administration
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Filing: 1970-01-27
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Granted: 1972-05-02
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Expires: 1990-01-27
Abstract
Abstract SILOXANE-CONTAINING EPOXY POLYMERS ARE PREPARED BY REACTING SILOXANE-CONTAINING EPOXIDES WITH SILOXANE-CONTAINING DIAMINES. BOTH THE EPOXIDE, EXEMPLIFIED BY THE FORMULA 2-(4-((4-(OXIRANYL-(CH2)X-)PHENYL)-(SI(-R)2-O)N-SI(-R)2-)- PHENYL-(CH2)X-)OXIRANE AND THE DIAMINE REACTANT 1-((4-H2N-PHENYL)-O-SI(-R)2-(O-SI(-R)2)M-O-),4-NH2-BENZENE ARE CHARACTERIZED BY THEIR CAPABILITY OF INCLUSION OF A CONTROLLABLE NUMBER OF SILOXANE GROUPS. THE PRODUCT POLYMERS EXHIBIT A LOW DIELECTRIC CONSTANT AND OTHER PROPERTIES FAVORABLE TO THEIR USE FOR ELECTRONIC PACKAGING APPLICATION. METHODS FOR PREPARATION OF THE REACTANT MONOMERS ARE ALSO DISCLOSED.
Inventors
- 👤 William J Fatterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/30; C08G59/306; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C08G59/40; C08G59/50; C08G59/504; C08G77/00; C08G77/04; C08G77/38; C08G77/48; C08G77/54
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |