US4076580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant cellulosic boards
Assignee: CIT Group Business Credit Inc
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Filing: 1977-03-24
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Granted: 1978-02-28
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Expires: 1997-03-24
Abstract
Abstract Cellulosic boards, such as hardboards, fiberboards and particle-boards, are flame retarded by incorporation of a synergistically acting alumina trihydrate-ulexite composition in the boards. The alumina trihydrate-ulexite flame-retarding agent provides a board of satisfactory strength properties with a flame spread at least equivalent to that of a commercial Class I-rated hardboard when the loading of the flame-retarding agent in the board is kept at 50% or below of the total weight of the flame-retarded board.
Inventors
- 👤 Erwin Panusch
- 👤 Igor Sobolev
- 👤 Stephen C. Carniglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
CPC Classifications
D; D21; D21J; D21J1/00; D21J1/16; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L61/00; C08L97/00; C08L97/02; C08L2201/00; C08L2201/02; C08L61/04; C08L61/06; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A process for producing flame-retardant cellulosic board which comprises incorporating in the board furnish a synergistically acting flame-retarding composition consisting of alumina hydrate and ulexite, wherein the quantity of alumina hydrate in the composition is maintained within the range of about 30-70% by weight of the composition and wherein this composition is incorporated in the board in an amount corresponding to about 30-50% by weight of the total weight of the flame-retarded board and forming the flame-retarded board.
Claim 2
Dependent Claim
78 words
A process for producing flame-retardant cellulosic board which comprises incorporating in the board furnish a synergistically acting flame-retarding composition consisting of alumina hydrate and ulexite, wherein the quantity of alumina hydrate in the composition is maintained within the range of about 30-70% by weight of the composition and wherein this composition is incorporated in the board in an amount corresponding to about 30-50% by weight of the total weight of the flame-retarded board and forming the flame-retarded board.
Claim 3
Dependent Claim
29 words
Process according to claim 1, wherein the quantity of alumina hydrate in the flame retarding composition is maintained within the range of about 50 to about 70% by weight.
Claim 4
Dependent Claim
40 words
Process according to claim 1, wherein the cellulosic board has a thickness of about 0.63 cm (1/4 inch) and the amount of flame-retarding composition in the cellulosic board corresponds to about 35 to 50% by weight of the flame-retarded board.
Claim 5
Dependent Claim
12 words
Process according to claim 1, wherein the cellulosic board is a hardboard.
Claim 6
Dependent Claim
12 words
Process according to claim 1, wherein the cellulosic board is a particle-board.
Claim 7
Dependent Claim
12 words
Process according to claim 1, wherein the cellulosic board is a fiberboard.
Claim 8
Dependent Claim
66 words
A flame-retarded cellulosic board containing a synergistically performing alumina hydrate-ulexite flame-retarding composition, wherein the amount of alumina hydrate in the composition is kept within the range of about 30 to about 70% by weight and the quantity of flame-retarding composition in the flame-retarded board is maintained within the range of about 30 to about 50% by weight based on the total weight of the flame-retarded board.
Claim 9
Dependent Claim
66 words
A flame-retarded cellulosic board containing a synergistically performing alumina hydrate-ulexite flame-retarding composition, wherein the amount of alumina hydrate in the composition is kept within the range of about 30 to about 70% by weight and the quantity of flame-retarding composition in the flame-retarded board is maintained within the range of about 30 to about 50% by weight based on the total weight of the flame-retarded board.
Claim 10
Dependent Claim
27 words
Article of claim 7, wherein the amount of alumina hydrate in the flame-retarding composition is kept within the range of about 50 to about 70% by weight.
Claim 11
Dependent Claim
11 words
Article of claim 7, wherein the cellulosic board is a hardboard.
Claim 12
Dependent Claim
11 words
Article of claim 7, wherein the cellulosic board is a particle-board.
Claim 13
Dependent Claim
11 words
Article of claim 7, wherein the cellulosic board is a fiberboard.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |