US4244781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-asbestos millboard composition
Assignee: BERJA CORP C/O CT Corp SYSTEMS Inc
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Filing: 1979-06-11
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Granted: 1981-01-13
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Expires: 1999-06-11
Abstract
Abstract A non-asbestos millboard refractory composition useful for the manufacture of lehr and glass tempering rolls and useful at temperatures above about 650° C. comprises on a dry weight basis 10-30 percent ceramic fiber, 0-10 percent organic fiber, 35-60 percent pyrophyllite and 20-35 percent inorganic binder. This composition is particularly useful in the manufacture of a non-asbestos millboard sheet which is formed by preparing an aqueous slurry of the components of this composition, adding flocculant and developing the flocculated composition into sheet form by placing the slurry on a rotating screened cylinder to effect formation and dewatering, transfering the dewatered and formed slurry to a synthetic felt and then to an accumulator roll, where layers of the slurry are accumulated upon one another to a desired thickness. The accumulated layers are then slit, removed and formed into flat sheets of desired dimensions for subsequent use.
Inventors
- 👤 Peter F. Heckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:21
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C03; C03B; C03B35/00; C03B35/14; C03B35/16; C03B35/18; C03B35/181; C03B35/185; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
27 words
A non-asbestos millboard refractory composition comprising on a dry weight basis 10-30 percent ceramic fiber, 0-10 percent organic fiber, 35-60 percent pyrophyllite and 20-35 percent inorganic binder.
Claim 2
Dependent Claim
27 words
A non-asbestos millboard refractory composition comprising on a dry weight basis 10-30 percent ceramic fiber, 0-10 percent organic fiber, 35-60 percent pyrophyllite and 20-35 percent inorganic binder.
Claim 3
Dependent Claim
23 words
A non-asbestos millboard refractory composition in accordance with claim 1 wherein the inorganic binder comprises 15-30 percent bentonite clay and 3-10 percent silicate.
Claim 4
Dependent Claim
35 words
A non-asbestos millboard refractory composition in accordance with claim 1 comprising on a dry weight basis 10-20 percent ceramic fiber, 2-5 percent organic fiber, 40-60 percent pyrophyllite, 15-30 percent bentonite clay and 3-10 percent silicate.
Claim 5
Dependent Claim
16 words
A non-asbestos millboard refractory composition in accordance with claim 1 wherein said silicate is sodium silicate.
Claim 6
Dependent Claim
17 words
A non-asbestos millboard refractory composition in accordance with claim 1 wherein said organic fiber comprises kraft fiber.
Claim 7
Dependent Claim
41 words
A non-asbestos and asbestos-free refractory millboard composition consisting essentially on a dry weight basis of 10-30% by weight ceramic fiber, 0-10% by weight Kraft cellulosic fiber, 30-60% by weight pyrophyllite, 10-30% by weight bentonite clay and 5-15% by weight sodium silicate.
Claim 8
Dependent Claim
41 words
A non-asbestos and asbestos-free refractory millboard composition consisting essentially on a dry weight basis of 10-30% by weight ceramic fiber, 0-10% by weight Kraft cellulosic fiber, 30-60% by weight pyrophyllite, 10-30% by weight bentonite clay and 5-15% by weight sodium silicate.
Claim 9
Dependent Claim
39 words
A lehr roll or glass tempering roll comprising substantially circular discs having the composition in accordance with claim 1 or 6 assembled, fitted and pressed onto a bar to provide a substantially cylindrical lehr roll or glass tempering roll.
Claim 10
Dependent Claim
31 words
A non-asbestos millboard sheet comprising on a dry weight basis 10-30 percent ceramic fiber, 0-10 percent organic fiber, 35-60 percent pyrophyllite, 20-35 percent inorganic binder and 0 to 5.0 percent flocculant.
Claim 11
Dependent Claim
31 words
A non-asbestos millboard sheet comprising on a dry weight basis 10-30 percent ceramic fiber, 0-10 percent organic fiber, 35-60 percent pyrophyllite, 20-35 percent inorganic binder and 0 to 5.0 percent flocculant.
Claim 12
Dependent Claim
22 words
A non-asbestos millboard sheet in accordance with claim 8 wherein the inorganic binder comprises 15-30 percent bentonite clay and 3-10 percent silicate.
Claim 13
Dependent Claim
39 words
A non-asbestos millboard sheet in accordance with claim 8 comprising on a dry weight basis 10-20 percent ceramic fiber, 2-5 percent organic fiber, 40-60 percent pyrophyllite, 15-30 percent bentonite clay, 3-10 percent silicate and 0.1 to 1.0 percent flocculant.
Claim 14
Dependent Claim
15 words
A non-asbestos millboard sheet in accordance with claim 8 wherein said silicate is sodium silicate.
Claim 15
Dependent Claim
16 words
A non-asbestos millboard sheet in accordance with claim 8, wherein said organic fiber comprises kraft fiber.
Claim 16
Dependent Claim
15 words
A non-asbestos millboard sheet in accordance with claim 8 wherein said flocculant comprises a polyelectrolyte.
Claim 17
Dependent Claim
15 words
A non-asbestos millboard sheet in accordance with claim 13 wherein said polyelectrolyte comprises a polyacrylamide.
Claim 18
Dependent Claim
54 words
A method of producing a non-asbestos millboard sheet in accordance with claim 8 which comprises admixing said organic fiber and said ceramic fiber, adding said pyrophyllite and said inorganic binder in water to form an aqueous slurry, and flocculating and coagulating said slurry to form said millboard sheet from said flocced and coagulated slurry.
Claim 19
Dependent Claim
27 words
A method in accordance with claim 15 wherein said flocculating and coagulating of said slurry to form said millboard sheet comprises adding flocculant to said aqueous slurry.
Claim 20
Dependent Claim
112 words
A method of producing a non-asbestos millboard sheet in accordance with claim 16 which comprises admixing said organic fiber and said ceramic fiber, adding said pyrophyllite and said inorganic binder in the form of an aqueous solution in order to form an aqueous slurry, adjusting the water content of said slurry to about 1.0 to 5.0 percent and the temperature to about 20.0° to 30.0° C., adding a low molecular weight cationic polymer in an amount from about 0.05 to 5.0 percent, then adding a high molecular weight cationic polymer in an amount from about 0.05 to 0.5 percent to coagulate said slurry and forming said millboard sheet from said coagulated slurry.
Claim 21
Dependent Claim
48 words
A method in accordance with claim 15 wherein said flocculating and coagulating of said slurry to form said millboard sheet comprises adjusting the alkalinity of said slurry to a pH in the range pH 10-13 to coagulate said slurry and forming said millboard sheet from said coagulated slurry.
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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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |