Patent US4404250A successfully refreshed from Google Patents.
US4404250A
Expired / Lapsed
US
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Fire-retardant high pressure consolidated articles containing an air-laid web and method of producing same
Assignee: Formica Corp
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Filing: 1982-09-23
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Granted: 1983-09-13
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Expires: 2002-09-23
Abstract
Abstract The invention relates to flame-retardant, high pressure consolidated articles containing an air-laid web and to a method of preparing such articles wherein boric acid or ammonium pentaborate is added as a flame-retardant additive.
Inventors
- 👤 Theodore R. Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:56
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; D06; D06M; D06M11/00; D06M11/80; D06M11/82; D21H27/00; D21H27/18; D21H27/22; D21H27/26; D21H17/00; D21H17/20; D21H17/33; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249925; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967; Y10T442/00; Y10T442/30; Y10T442/3927; Y10T442/60; Y10T442/693
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A fire-retardant heat and pressure consolidated article comprising, (a) a monostichous layer of randomly oriented, substantially non-hydrogen bonded, cellulosic fibers from about 0.5 mm to 2.5 mm in average length, said layer being from about 0.25 mm to 2.25 mm thick and containing from about 20% to 35%, by weight, based on the total weight of fiber, resin and flame retardant in (a), of a thermoset resin and a flame-retarding amount (a) of boric acid or ammonium pentaborate.
Claim 2
Dependent Claim
78 words
A fire-retardant heat and pressure consolidated article comprising, (a) a monostichous layer of randomly oriented, substantially non-hydrogen bonded, cellulosic fibers from about 0.5 mm to 2.5 mm in average length, said layer being from about 0.25 mm to 2.25 mm thick and containing from about 20% to 35%, by weight, based on the total weight of fiber, resin and flame retardant in (a), of a thermoset resin and a flame-retarding amount (a) of boric acid or ammonium pentaborate.
Claim 3
Dependent Claim
19 words
An article in accordance with claim 1 containing, positioned atop said (a), (b) a thermost resin impregnated, decorative sheet.
Claim 4
Dependent Claim
21 words
An article in accordance with claim 2 containing, positioned atop said (b), (c) a thermoset resin impregnated alpha-cellulose transparent overlay sheet.
Claim 5
Dependent Claim
29 words
An article in accordance with claim 3 wherein the thermoset resin in (a) is a phenolic resin and the thermoset resin in (b) and (c) is a melamine/formaldehyde resin.
Claim 6
Dependent Claim
27 words
An article in accordance with claim 2 wherein the thermoset resin in (a) is a phenolic resin and the thermoset resin in (b) is a melamine/formaldehyde resin.
Claim 7
Dependent Claim
14 words
An article in accordance with claim 1 in which the flame-retardant is boric acid.
Claim 8
Dependent Claim
17 words
An article in accordance with claim 1 wherein the thermoset resin in (a) is a phenolic resin.
Claim 9
Dependent Claim
142 words
A method of producing the article of claim 1 which comprises, (1) defibrating cellulosic fibers to produce fibers of an average length of about 0.5 to 2.5 mm in the presence of air to thereby form an air-fiber stream, (2) incorporating into said air-fiber stream from about 20% to about 35%, by weight, based on the total weight of fiber and resin, of particles of a thermosetting resin and a flame-retarding amount of boric acid or ammonium pentaborate to thereby form an air-fiber-resin flame-retardant stream, (3) depositing the fibers, flame-retardant and resin from said air-fiber-resin flame-retardant stream onto a foraminous belt at a thickness ranging from about 5 to about 100 mm, (4) pre-consolidating the deposited fibers, flame retardant and resin to a thickness of from about 0.5-10.0 mm to form a pre-consolidated layer, (5) heat and pressure consolidating said pre-consolidated layer.
Claim 10
Dependent Claim
38 words
A method in accordance with claim 8 wherein said pre-consolidated layer is formed into a laminate assembly comprising, in superimposed relationship, (A) said pre-consolidated layer and (B) a thermosetting resin impregnated decorative sheet before conducting said step (5).
Claim 11
Dependent Claim
23 words
A method in accordance with claim 9 wherein said laminate assembly contains, atop said (B), (C) a thermosetting resin impregnated, alpha-cellulose overlay sheet.
Claim 12
Dependent Claim
20 words
A method in accordance with claim 8 wherein said thermosetting resin in said air-fiber-flame-retardant resin stream is a phenolic resin.
Claim 13
Dependent Claim
12 words
A method according to claim 8 wherein the flame-retardant is boric acid.
References Cited (Backward Citations)
US4374171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |