Patent US3436133A successfully refreshed from Google Patents.
US4032393A
Expired / Lapsed
US
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Fire retardant webs and internal treatment therefor
Assignee: Upson Co
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Filing: 1976-04-05
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Granted: 1977-06-28
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Expires: 1996-04-05
Abstract
Abstract Fire retardant cellulosic webs are produced by intimately admixing cellulosic fibers and hydrated aluminum oxide particles and subsequently compressing the admixture to a self-sustaining web. Construction boards are fabricated by laminating a plurality of such webs.
Inventors
- 👤 Franz J. Alfeis
- 👤 Raymond W. Goldsmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:59
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H27/00; D21H27/30; D21H5/00; D21H5/0002; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/27; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
138 words
A process for the internal treatment of cellulosic webs to impart improved fire retardancy thereto, comprising the steps of: (a) admixing cellulosic fibers and an effective quantity of a fire-retardant filler of hydrated aluminum oxide particles; (b) consolidating the admixture into a self-sustaining web comprised of a physical admixture of discrete aluminum oxide particles and cellulosic fibers; and, (c) compressing said web to impart improved fire retardancy characteristics thereto; wherein said hydrated aluminum oxide particles are added to be present in the range of from about 27% to about 36% based upon the weight of said web, and wherein the compressing step provides a force of from about 300 to about 700 pounds per linear inch to yield an ultimate density of said web in the range of from about 38 to about 52 pounds per cubic foot.
Claim 2
Dependent Claim
138 words
A process for the internal treatment of cellulosic webs to impart improved fire retardancy thereto, comprising the steps of: (a) admixing cellulosic fibers and an effective quantity of a fire-retardant filler of hydrated aluminum oxide particles; (b) consolidating the admixture into a self-sustaining web comprised of a physical admixture of discrete aluminum oxide particles and cellulosic fibers; and, (c) compressing said web to impart improved fire retardancy characteristics thereto; wherein said hydrated aluminum oxide particles are added to be present in the range of from about 27% to about 36% based upon the weight of said web, and wherein the compressing step provides a force of from about 300 to about 700 pounds per linear inch to yield an ultimate density of said web in the range of from about 38 to about 52 pounds per cubic foot.
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein said admixture is formed as a batch in a pulper wherein said aluminum oxide particles are added to a pulp slurry of said cellulosic fibers.
Claim 4
Dependent Claim
56 words
The process of claim 2, further comprising: (a) refining said admixture to chop and fiberize said pulp; (b) thickening said admixture to remove water from said slurry; (c) depositing said admixture on a web-forming device; and (d) drying said admixture to form a self-sustaining web of said cellulosic fibers intimately admixed with said aluminum oxide particles.
Claim 5
Dependent Claim
17 words
The process of claim 3, further including the step of calendering said web during said compressing step.
Claim 6
Dependent Claim
32 words
The process of claim 2, wherein said aluminum oxide particles are added to be present in a range of from about 30% to about 33% based upon the weight of said web.
Claim 7
Dependent Claim
45 words
The process of claim 2, wherein said compressing step provides a force of from about 400 to about 450 pounds per linear inch to yield an ultimate density of said web within the range of from about 42 to about 46 pounds per cubic foot.
Claim 8
Dependent Claim
73 words
The process of claim 2, wherein said aluminum oxide particles are added to be present in the range of from about 30% to about 33% based upon the weight of said web, and wherein said compressing step provides a force of from about 400 to about 450 pounds per linear inch to yield an ultimate density of said web within the range of from about 42 to about 46 pounds per cubic foot.
Claim 9
Dependent Claim
21 words
The process of claim 1, further comprising the step of laminating a plurality of said webs to form a construction board.
Claim 10
Dependent Claim
67 words
A cellulosic web having improved fire retardancy characteristics comprised of a compressed, intimate physical admixture of discrete cellulosic fibers and an effective quantity of discrete fire-retardant hydrated aluminum oxide particles, wherein said aluminum oxide particles comprise from about 27% to about 36% of the weight of the web, said web having a density in the range of from about 38 to about 52 pounds per cubic foot.
Claim 11
Dependent Claim
67 words
A cellulosic web having improved fire retardancy characteristics comprised of a compressed, intimate physical admixture of discrete cellulosic fibers and an effective quantity of discrete fire-retardant hydrated aluminum oxide particles, wherein said aluminum oxide particles comprise from about 27% to about 36% of the weight of the web, said web having a density in the range of from about 38 to about 52 pounds per cubic foot.
Claim 12
Dependent Claim
23 words
The web of claim 9, wherein said aluminum oxide particles comprise from about 30% to about 33% of the weight of said web.
Claim 13
Dependent Claim
28 words
The web of claim 9, wherein said admixture has been compressed to a density within the range of from about 42 to about 46 pounds per cubic foot.
Claim 14
Dependent Claim
42 words
The web of claim 9, wherein said aluminum oxide particles comprise from about 30% to about 33% of the weight of said web, said web having a density within the range of from about 42 to about 46 pounds per cubic foot.
Claim 15
Dependent Claim
14 words
A laminated construction board comprised of a plurality of the webs of claim 9.
Claim 16
Dependent Claim
11 words
The web made in accordance with the process of claim 2.
Claim 17
Dependent Claim
13 words
The laminated construction board made in accordance with the process of claim 8.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |