Patent US4032392A successfully refreshed from Google Patents.
US4032392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the freeness of asbestos slurries
Assignee: Armstrong World Industries Inc
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Filing: 1976-08-06
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Granted: 1977-06-28
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Expires: 1996-08-06
Abstract
Abstract This invention represents an improvement in the method for making beater-saturated products by forming a slurry of asbestos fibers in water, precipitating a synthetic, non-film forming, organic binder in particulate form on said fibers to form a slurry of coated fibers, draining the slurry of coated fibers and forming a product therefrom. The improvement in accordance with this invention comprises controlling the drainage time of the slurry of coated fibers by adding to such slurry a film-forming secondary binder.
Inventors
- 👤 Frank J. Koller, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:29
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H13/00; D21H13/36; D21H13/38; D21H13/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
In a method of making beater-saturated asbestos sheets by forming a slurry of asbestos fibers in water, precipitating a synthetic non-film-forming organic binder in particulate form on said fibers to form a slurry of coated fibers, draining said slurry of coated fibers and forming a product therefrom, the improvement in controlling said draining comprising adding to the slurry of coated fibers a film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof wherein said synthetic, non-film-forming organic binder and said film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof are first blended in a ratio of about 85:15 to 75:25 and added to said slurry of asbestos fibers in water.
Claim 2
Dependent Claim
109 words
In a method of making beater-saturated asbestos sheets by forming a slurry of asbestos fibers in water, precipitating a synthetic non-film-forming organic binder in particulate form on said fibers to form a slurry of coated fibers, draining said slurry of coated fibers and forming a product therefrom, the improvement in controlling said draining comprising adding to the slurry of coated fibers a film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof wherein said synthetic, non-film-forming organic binder and said film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof are first blended in a ratio of about 85:15 to 75:25 and added to said slurry of asbestos fibers in water.
Claim 3
Independent Claim
112 words
A method for forming a beater-saturated asbestos sheet which comprises the steps of: (a) forming an aqueous slurry of asbestos fiber; (b) adding a synthetic latex to the slurry, said latex comprising a blend of a synthetic non-film-forming organic binder and a synthetic film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof, said non-film-forming organic binder: film-forming secondary binder in a ratio of 85:15 to about 75:25; wherein said latex is evenly coated on said asbestos fibers; and (c) draining the coated asbestos fibers, thereby forming an asbestos sheet, said draining having a drain time of less than about 60 seconds as measured in a standard Williams 12" × 12" sheet mold.
Claim 4
Independent Claim
112 words
A method for forming a beater-saturated asbestos sheet which comprises the steps of: (a) forming an aqueous slurry of asbestos fiber; (b) adding a synthetic latex to the slurry, said latex comprising a blend of a synthetic non-film-forming organic binder and a synthetic film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof, said non-film-forming organic binder: film-forming secondary binder in a ratio of 85:15 to about 75:25; wherein said latex is evenly coated on said asbestos fibers; and (c) draining the coated asbestos fibers, thereby forming an asbestos sheet, said draining having a drain time of less than about 60 seconds as measured in a standard Williams 12" × 12" sheet mold.
Claim 5
Dependent Claim
10 words
The asbestos sheet made by the method of claim 2.
Claim 6
Independent Claim
103 words
A method for forming a beater-saturated asbestos sheet which comprises the steps of (a) forming an aqueous slurry of asbestos fiber; (b) adding to the slurry a synthetic non-film-forming organic binder; (c) adding to the slurry formed in step (b) a synthetic film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof, said synthetic non-film-forming organic binder:synthetic film-forming secondary binder in a ratio of 85:15 to about 75:25; (d) draining the slurry formed in step (c), thereby forming an asbestos sheet, said draining having a drain time of less than about 60 seconds as measured in a standard Williams 12" × 12" sheet mold.
Claim 7
Independent Claim
103 words
A method for forming a beater-saturated asbestos sheet which comprises the steps of (a) forming an aqueous slurry of asbestos fiber; (b) adding to the slurry a synthetic non-film-forming organic binder; (c) adding to the slurry formed in step (b) a synthetic film-forming secondary binder of poly(vinylidene chloride) or copolymers thereof, said synthetic non-film-forming organic binder:synthetic film-forming secondary binder in a ratio of 85:15 to about 75:25; (d) draining the slurry formed in step (c), thereby forming an asbestos sheet, said draining having a drain time of less than about 60 seconds as measured in a standard Williams 12" × 12" sheet mold.
Claim 8
Dependent Claim
10 words
The asbestos sheet made by the method of claim 4.
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) | 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 |