US4371579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant filler sheet laminates
Assignee: International Paper Co
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Filing: 1980-10-09
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Granted: 1983-02-01
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Expires: 2000-10-09
Abstract
Abstract A fire-resistant laminate is made, comprising a plurality of heat and pressure consolidated thermoset resin impregnated filler sheets, where the filler sheets before resin impregnation comprised from about 60 wt. % to about 90 wt. % inorganic filler, up to about 25 wt. % cellulose fibers and from about 0.5 wt. % to about 20 wt. % resinous binder.
Inventors
- 👤 Harold O. McCaskey
- 👤 Melvin E. Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:56
CPC Classifications
B; B32; B32B; B32B19/00; B32B19/02; B32B19/06; D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; D21H27/00; D21H27/30; D21H5/00; D21H5/0002; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/25; Y10T428/251; Y10T428/256; Y10T428/259; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/659; Y10T442/664
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A fire-resistant laminate comprising a plurality of thermoset resin impregnated filler sheets, the filler sheets before resin impregnation consisting of from about 60 wt. % to about 90 wt. % inorganic filler selected from the group consisting of aluminum trihydrate, magnesium silicate, magnesium hydroxide, magnesium carbonate, calcium silicate, calcium carbonate, mica, silica, and mixtures thereof, from about 5% up to about 25 wt. % cellulose fibers and from about 0.5 wt. % to about 20 wt. % resinous binder, the plurality of thermoset resin impregnated filler sheets being heat and pressure consolidated and bonded together into a unitary member, and having a resin ratio of from about 1.20 to about 4.0.
Claim 2
Dependent Claim
111 words
A fire-resistant laminate comprising a plurality of thermoset resin impregnated filler sheets, the filler sheets before resin impregnation consisting of from about 60 wt. % to about 90 wt. % inorganic filler selected from the group consisting of aluminum trihydrate, magnesium silicate, magnesium hydroxide, magnesium carbonate, calcium silicate, calcium carbonate, mica, silica, and mixtures thereof, from about 5% up to about 25 wt. % cellulose fibers and from about 0.5 wt. % to about 20 wt. % resinous binder, the plurality of thermoset resin impregnated filler sheets being heat and pressure consolidated and bonded together into a unitary member, and having a resin ratio of from about 1.20 to about 4.0.
Claim 3
Dependent Claim
14 words
The fire-resistant laminate of claim 1 also containing at least one fibrous glass sheet.
Claim 4
Dependent Claim
16 words
The fire-resistant laminate of claim 1 also containing at least one decorative, resin impregnated surface sheet.
Claim 5
Dependent Claim
23 words
The fire-resistant laminate of claim 1 also containing up to about 10 wt. % glass fibers having lengths up to about 40 mm.
Claim 6
Dependent Claim
65 words
The fire-resistant laminate of claim 1, where the thermoset resin impregnating the filler sheets is selected from the group consisting of epoxy resin, polyester resin, melamine resin, silicon resin, polyimide resin and phenolic resin, and the resin impregnated filler sheets are consolidated and bonded at temperatures ranging from about 120° C. to about 180° C., and pressures ranging from about 250 psi. to 1,500 psi.
Claim 7
Dependent Claim
40 words
The fire-resistant laminate of claim 1, where the thermoset resin impregnating the filler sheets is a phenolic resin, and the laminate contains at least one centrally located phenolic resin impregnated fibrous glass sheet disposed between the resin impregnated filler sheets.
Claim 8
Dependent Claim
41 words
The fire-resistant laminate of claim 1, wherein the thermoset resin impregnating the filler sheets is a phenolic resin, and the laminate contains at least one resin impregnated print sheet disposed on at least one side of the resin impregnated filler sheets.
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |