US3795526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphazene fire retardants
Assignee: Ethyl Corp
•
Filing: 1972-08-30
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Granted: 1974-03-05
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Expires: 1992-08-30
Abstract
Abstract IMPROVED FIRE RETARDANT PHOSPHONITRILATE POLYMER COMPOSITIONS HAVING TWO CYCLIC OLIGOMERIC PHOSPHONITRILATE COMPOUNDS, SUCH AS HEXAPROPOSYPHOSPHRAZENE, CROSSLINKED BY OXYGEN FROMING A P-O-P BOND. THE CROSSLINKED PHOSPHONITRILATE COMPOUNDS ARE PREPARED BY REACTING A CHLOROPHOSPHAZENE WITH A METAL ALCOHOLATE, PREFERABLY SODIUM PROPOXIDE, AND AN ALKALI METAL HYDROXIDE, PREFERABLY SODIUM HYDROXIDE.
Inventors
- 👤 C Bergeron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:25
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/65812; C08; C08G; C08G79/00; C08G79/02; C08G79/025
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |