Patent US4530777A successfully refreshed from Google Patents.
US4530777A
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Polyurethane foams and processes for preparation
Assignee: Crehan and Fricke
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Filing: 1983-07-29
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Granted: 1985-07-23
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Expires: 2003-07-29
Abstract
Abstract Polyurethane foams which may be rendered flame resistant by the addition of flame retardants are produced by reaction between a carbohydrate, a polyisocyanate and water in the presence of a suitable surfactant and polyurethane forming catalyst.
Inventors
- 👤 Richard B. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3218; C08G18/40; C08G18/64; C08G18/6484; C08J9/0014; C08J9/0038; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0083; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
A mixture useful for the preparation of polyurethane foams consisting of polyisocyanate, a surfactant, a blowing agent and a flame retardant.
Claim 2
Dependent Claim
21 words
A mixture useful for the preparation of polyurethane foams consisting of polyisocyanate, a surfactant, a blowing agent and a flame retardant.
Claim 3
Dependent Claim
28 words
A mixture as in claim 1 comprising 5 to 200 parts polyisocyanate, 0.1 to 2.0 parts by weight surfactant and 5 to 75 parts by weight flame retardant.
Claim 4
Dependent Claim
38 words
A mixture as in claim 1 or 2 wherein the flame retardant is selected from the group consisting of sodium chloride, calcium chloride, alkali metal borates, tri-cresyl phosphate, tris(2-chloroethyl)phosphate, tris-(chloropropyl)phosphate, O,O-diethyl-N,N-bis-(2-hydroxyethyl)aminoethyl phosphate, antimony oxide, alumina, and antimony oxychloride.
Claim 5
Dependent Claim
24 words
A mixture as in claim 1 wherein the blowing agent is selected from the group consisting of methylene chloride ethylenetrichloride, trichloromonofluoromethane, dichlorodifluoromethane, and dichlorotetrafluoroethane.
Claim 6
Dependent Claim
13 words
A mixture as in claim 35 wherein the polyisocyanate is a polymeric isocyanate.
Claim 7
Dependent Claim
13 words
A mixture as in claim 2 wherein the polyisocyanate is a polymeric isocyanate.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |