US4486468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant foam
Assignee: ANTI-FIRE-FOAM Inc A CORP OF GA
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Filing: 1982-08-27
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Granted: 1984-12-04
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Expires: 2002-08-27
Abstract
Abstract Fire retardant polyurethane foam materials and methods of producing the same are disclosed. Such foams are produced by encapsulating or depositing fire retardant materials within the cell structure of previously formed foam materials. In one embodiment, the foam is passed through a liquid medium containing fire retardant materials, with the foam being subjected to periodic compression during contact with the liquid medium. In an alternative embodiment, the foam is subjected to a dust or particulate atmosphere in which fire retardant material is the particulate material.
Inventors
- 👤 Stanley D. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:54
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5618; C; C09; C09K; C09K21/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A method of producing fire retardant foam material from already produced felxible foam which includes: contacting said foam material with a dust or dry particulate atmosphere in which a fire retardant material selected from the group consisting of urea, sodium bicarbonate and ammonium sulfate is the particulate material; compressing the foam material while said foam material is in contact with said particulate atmosphere; releasing the compression on the foam so as to allow particulate material to be absorbed within the cell structure of the foam material; injecting fire retardant material into the interior of the foam material through a plurality of hollow needles; and passing air into the foam to expand the foam prior to injection of the fire retardant material.
Claim 2
Independent Claim
121 words
A method of producing fire retardant foam material from already produced felxible foam which includes: contacting said foam material with a dust or dry particulate atmosphere in which a fire retardant material selected from the group consisting of urea, sodium bicarbonate and ammonium sulfate is the particulate material; compressing the foam material while said foam material is in contact with said particulate atmosphere; releasing the compression on the foam so as to allow particulate material to be absorbed within the cell structure of the foam material; injecting fire retardant material into the interior of the foam material through a plurality of hollow needles; and passing air into the foam to expand the foam prior to injection of the fire retardant material.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the air is passed into the foam through a plurality of hollow needles injected into the foam.
References Cited (Backward Citations)
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Cited
US4073979A
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US4247971A
Cited
US4342798A
Cited
US4224374A
Cited
US4223066A
Cited
US4305976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |