US4504603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant polyurethane foam containing finely ground dry fire retardant particles containing a volatile active fire retardant component
Assignee: Individual
•
Filing: 1983-09-23
•
Granted: 1985-03-12
•
Expires: 2003-09-23
Abstract
Abstract A molded polyurethane foamed shape has finely ground dry fire-retardant particles containing a volatile active fire-retardant component which releases fire-retardant gas when exposed to fire and distributed throughout the shape and encapsulated by the polyurethane so as to protect the component against evaporation until exposed by initial burning of the shape.
Inventors
- 👤 Hamilton Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A molded polyurethane foamed shape having finely ground dry fire retardant particles containing a volatile active fire retardant component which release fire-retardant gas when exposed to fire and distributed throughout the shape and encapsulated by the polyurethane so as to protect said component against evaporation until exposed by initial burning of the shape.
Claim 2
Dependent Claim
53 words
A molded polyurethane foamed shape having finely ground dry fire retardant particles containing a volatile active fire retardant component which release fire-retardant gas when exposed to fire and distributed throughout the shape and encapsulated by the polyurethane so as to protect said component against evaporation until exposed by initial burning of the shape.
Claim 3
Dependent Claim
23 words
The shape of claim 1 in which said fire retardant particles comprise a mixture of ammonium phosphate, ammonium chloride, sodium carbonate and borax.
Claim 4
Independent Claim
68 words
A method for making a fire retardant polyurethane shape, comprising mixing finely ground particles of a solid fire retardant containing a volatile active component which release fire-retardant gas when exposed to fire in a blend of polyurethane, foaming agent and catalyst, to form a mix, and placing the mix in a die in which the mix foams to form the shape with said particles encapsulated by the polyurethane.
Claim 5
Independent Claim
68 words
A method for making a fire retardant polyurethane shape, comprising mixing finely ground particles of a solid fire retardant containing a volatile active component which release fire-retardant gas when exposed to fire in a blend of polyurethane, foaming agent and catalyst, to form a mix, and placing the mix in a die in which the mix foams to form the shape with said particles encapsulated by the polyurethane.
Claim 6
Dependent Claim
23 words
The method of claim 3 in which said fire retardant particles comprise a mixture of ammonium phosphate, ammonium chloride, sodium carbonate and borax.
References Cited (Backward Citations)
US3330783A
Cited
US4315078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |