US3591530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polymers containing phosphorus and nitrogen
Assignee: Sandoz AG
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Filing: 1969-10-06
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Granted: 1971-07-06
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Expires: 1989-10-06
Abstract
Abstract PHOSPHORUS- AND NITROGEN-CONTAINING POLYMERS WHICH ARE SUITABLE AS FLAME-PROOFING AGENTS AND ARE OBTAINED BY REACTING PHOSPHONITRILIC HALIDES, ESPECIALLY THE CHLORIDES, WITH ORGANIC COMPOUNDS CONTAINING 2, 3 OR 4 ALIPHATICALLY BOUND HYDROXY GROUPS AND OPTIONALLY HEATING THE REACTION PRODUCTS WITH AMMONIA, A PRIMARY OR SECONDARY AMINE.
Inventors
- 👤 Urs Sollberger
- 👤 Rainer Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M15/673; C; C08; C08G; C08G79/00; C08G79/02; C08G79/025
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |