US4159224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a fiber composite
Assignee: LAXA BRUK A Ltd Co OF SWEDISH AB
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Filing: 1977-06-07
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Granted: 1979-06-26
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Expires: 1997-06-07
Abstract
Abstract A method for producing shaped bodies of fibrous materials using mineral fibers, cellulosic fibers, and zero fibers. The zero fibers are extremely thin and short cellulosic fibers produced either synthetically or from natural by-products from the cellulose industry. These bodies can be used as substitutes for asbestos fiber products, and display physical properties, such as resistance and rigidity, comparable to the asbestos products. The fibrous materials are produced using an aqueous dispersion of the mineral fibers, cellulose fibers, and zero fibers, whereafter the dispersion is de-watered, shaped and dried.
Inventors
- 👤 Gunnar Cederqvist
- 👤 Ulf Aberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:04
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/18; D06; D06N; D06N7/00; D06N7/0005; D06N7/006; D21H13/00; D21H13/36; Y; Y10; Y10S; Y10S162/00; Y10S162/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A method for the production of a shaped fibrous body comprising the steps of: providing an aqueous dispersion comprising mineral fibers and cellulose fibers, the amount of mineral fibers being from 30-90% by weight based on the total fiber weight and the amount of cellulose fibers being from 10 to 70% by weight, based on the total fiber weight, said cellulose fibers including from 50 to 78% of natural zero fibers, said natural zero fibers being the thin and short cellulose fibers which pass through a conventional wire in the formation of cellulose products; dewatering the dispersion; shaping the dewatered dispersion; and drying the dewatered and shaped dispersion to provide a shaped fibrous body.
Claim 2
Independent Claim
114 words
A method for the production of a shaped fibrous body comprising the steps of: providing an aqueous dispersion comprising mineral fibers and cellulose fibers, the amount of mineral fibers being from 30-90% by weight based on the total fiber weight and the amount of cellulose fibers being from 10 to 70% by weight, based on the total fiber weight, said cellulose fibers including from 50 to 78% of natural zero fibers, said natural zero fibers being the thin and short cellulose fibers which pass through a conventional wire in the formation of cellulose products; dewatering the dispersion; shaping the dewatered dispersion; and drying the dewatered and shaped dispersion to provide a shaped fibrous body.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein the mineral fiber content is from 30 to 70% by weight based on the total weight of fibers.
Claim 4
Dependent Claim
81 words
In a shaped fibrous body comprising mineral fibers, the improvement wherein the fibrous composition of the shaped body comprises 30 to 90% mineral fibers, and from 10 to 70% by weight of cellulose fibers based on the total weight of the fibers, and wherein from 50 to 78% by weight of the cellulose fibers comprise natural zero fibers, said natural zero fibers being the thin and short cellulose fibers which pass through a conventional wire in the formation of cellulose products.
Claim 5
Dependent Claim
81 words
In a shaped fibrous body comprising mineral fibers, the improvement wherein the fibrous composition of the shaped body comprises 30 to 90% mineral fibers, and from 10 to 70% by weight of cellulose fibers based on the total weight of the fibers, and wherein from 50 to 78% by weight of the cellulose fibers comprise natural zero fibers, said natural zero fibers being the thin and short cellulose fibers which pass through a conventional wire in the formation of cellulose products.
Claim 6
Dependent Claim
32 words
An improved shaped fibrous body according to claim 3 wherein the content of mineral fibers is from 30 to 70% by weight based on the weight of mineral fibers and cellulose fibers.
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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |