US3058872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible asbestos-cement products
Assignee: Armstrong World Industries Inc
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Filing: 1960-11-16
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Granted: 1962-10-16
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Expires: 1980-11-16
Abstract
No abstract record available.
Inventors
- 👤 Jr David A Feigley
- 👤 William M Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:41
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS OF FORMING AN UNCURED WATER-LAID FLEXIBLE SHEET OF ASBESTOS-CEMENT WHICH COMPRISES FORMING AN AQUEOUS SLURRY CONTAINING 90%-99.5% BY WEIGHT WATER, THE BALANCE BEING SOLIDS COMPRISING 5%-50% BY WEIGHT ASBESTOS FIBERS AND 25%-95% BY WEIGHT HYDRAULIC CEMENT, PASSING THE SLURRY TO THE DRAINAGE WIRE OF A SHEET-FORMING MACHINE TO FORM A SHEET, DRAINING THE WATER FROM THE SHEET, AND DRYING THE SHEET TO A MOISTURE CONTENT OF LESS THAN 5% BY WEIGHT TO PRODUCE AN ASBESTOS-CEMENT SHEET HAVING SUFFICIENT FLEXIBILITY UP TO A THICKNESS OF 3/16" TO BE BENT, WITHOUT BREAKING, AROUND A CORE HAVING A DIAMESTER TEN TIMES THE THICKNESS OF THE SHEET, THE ELAPSED TIME BETWEEN FORMING THE SLURRY CONTAINING THE HYDRAULIC CEMENT AND DRYING THE SHEET CONTAINING THE HYDRAULIC CEMENT BEING LESS THAN ABOUT 6 HOURS TO PREVENT SUB-T SUBSTANTIAL HYDRATION OF THE HYDRAULIC CEMENT.T.
Claim 2
Dependent Claim
139 words
A PROCESS OF FORMING AN UNCURED WATER-LAID FLEXIBLE SHEET OF ASBESTOS-CEMENT WHICH COMPRISES FORMING AN AQUEOUS SLURRY CONTAINING 90%-99.5% BY WEIGHT WATER, THE BALANCE BEING SOLIDS COMPRISING 5%-50% BY WEIGHT ASBESTOS FIBERS AND 25%-95% BY WEIGHT HYDRAULIC CEMENT, PASSING THE SLURRY TO THE DRAINAGE WIRE OF A SHEET-FORMING MACHINE TO FORM A SHEET, DRAINING THE WATER FROM THE SHEET, AND DRYING THE SHEET TO A MOISTURE CONTENT OF LESS THAN 5% BY WEIGHT TO PRODUCE AN ASBESTOS-CEMENT SHEET HAVING SUFFICIENT FLEXIBILITY UP TO A THICKNESS OF 3/16" TO BE BENT, WITHOUT BREAKING, AROUND A CORE HAVING A DIAMESTER TEN TIMES THE THICKNESS OF THE SHEET, THE ELAPSED TIME BETWEEN FORMING THE SLURRY CONTAINING THE HYDRAULIC CEMENT AND DRYING THE SHEET CONTAINING THE HYDRAULIC CEMENT BEING LESS THAN ABOUT 6 HOURS TO PREVENT SUB-T SUBSTANTIAL HYDRATION OF THE HYDRAULIC CEMENT.T.
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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |