Patent US3905922A successfully refreshed from Google Patents.
US3905922A
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Flame retardant urethane forms containing alkanol amino phosphonates
Assignee: Pharmacia and Upjohn Co
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Filing: 1974-10-07
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Granted: 1975-09-16
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Expires: 1994-10-07
Abstract
Abstract Compounds are described which are useful as flame retardants for chemical incorporation into polyurethane and like polymer foams and which have the formula: wherein R1 and R2 are each hydrocarbyl or halohydrocarbyl, CnH2 n is alkylene (Ca-b) and R3 and R4 taken together with the attached C atom are the residue of a cycloalkane, cycloalkene or cycloalkanone. The compounds have two active hydrogen atoms (marked with an asterisk) which show substantially equal reactivity towards isocyanato groups in sharp contrast to closely related compounds hitherto known. D R A W I N G
Inventors
- 👤 Curtis P Smith
- 👤 Henri Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/3889; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C07F9/4018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A FIRE RETRDANT POLYURETHANE WHICH COMPRISES THE PRODUCT OF REACTION OF A POLYOL AND A POLYISOCYANATE UNDER FOAM PRODUCING CONDITIONS CHARACTERIZED IN THAT AT LEAST PART OF SAID POLYOL COMPRISES A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
35 words
A FIRE RETRDANT POLYURETHANE WHICH COMPRISES THE PRODUCT OF REACTION OF A POLYOL AND A POLYISOCYANATE UNDER FOAM PRODUCING CONDITIONS CHARACTERIZED IN THAT AT LEAST PART OF SAID POLYOL COMPRISES A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |