US3563918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal containing polymers from cyclic tetrameric phenylphosphonitril amides
Assignee: National Aeronautics and Space Administration
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Filing: 1968-03-18
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Granted: 1971-02-16
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Expires: 1988-03-18
Abstract
Abstract NEW POLYMERS HAVE BEEN PREPARED WHICH CONTAIN BOTH CYCLIC TETRAMERIC TETRAPHENYLPHOSPHONITRILIC UNITS AND TRANSITION METAL SALTS CONTAINING METALLIC CATIONS CHOSEN FROM THE GROUP CONSISTING OF COPPER (II), COBALT (II), NICKEL (II), AND IRON (II). THESE POLYMERS ARE UNIQUE IN PHOSPHONITRILIC CHEMISTRY IN THAT THEY ARE SOLUBLE IN COMMON ORGANIC SOLVENTS AND ARE THERMALLY STABLE ABOVE 500*C.
Inventors
- 👤 Robert M Murch
- 👤 Thomas Bieniek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/14
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |