US2940893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled precipitation of rubber onto asbestos fibers
Assignee: Armstrong World Industries Inc
•
Filing: 1957-12-23
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Granted: 1960-06-14
•
Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Jr David A Feigley
- 👤 Jr Leonard N Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:07
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/42; C; C04; C04B; C04B26/00; C04B26/02; C04B26/04; D21H5/00; D21H5/12; D21H5/18; D21H5/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF MAKING A FELTED ASBESTOS SHEET WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF ASBESTOS FIBERS CONTAINING 10-90% BY WEIGHT CHRYSOTILE ASBESTOS FIBERS AND 90-10% BY WEIGHT CROCIDOLITE ASBESTOS FIBERS BASED ON THE TOTAL WEIGHT OF ASBESTOS IN SAID SLURRY, ADDING A SYNTHETIC RUBBER LATEX TO THE RESULTING SLURRY WHILE AGITATING SAID SLURRY WHEREBY THE RUBBER CONTENT OF SAID LATEX IS EVENLY DEPOSITED ON THE ASBESTOS FIBERS, AND FORMING THE RESULTING SLURRY OF COATED FIBERS INTO A SHEET.
Claim 2
Independent Claim
79 words
A METHOD OF MAKING A FELTED ASBESTOS SHEET WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF ASBESTOS FIBERS CONTAINING 10-90% BY WEIGHT CHRYSOTILE ASBESTOS FIBERS AND 90-10% BY WEIGHT CROCIDOLITE ASBESTOS FIBERS BASED ON THE TOTAL WEIGHT OF ASBESTOS IN SAID SLURRY, ADDING A SYNTHETIC RUBBER LATEX TO THE RESULTING SLURRY WHILE AGITATING SAID SLURRY WHEREBY THE RUBBER CONTENT OF SAID LATEX IS EVENLY DEPOSITED ON THE ASBESTOS FIBERS, AND FORMING THE RESULTING SLURRY OF COATED FIBERS INTO A SHEET.
References Cited (Backward Citations)
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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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |