US2868641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beater saturated sheets having increased strength
Assignee: Armstrong World Industries Inc
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Filing: 1956-07-20
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Granted: 1959-01-13
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Jr David A Feigley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/04; D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/42; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/37; D21H17/41; D21H17/42; D21H17/43; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE METHOD OF INCREASING THE TENSILE STRENGTH OF A BEATER SATURATED SHEET, WHICH METHOD COMPRISES FORMING A SLURRY OF PAPERMAKING FIBERS IN WATER, DEPOSITING A SYNTHETIC RUBBER BINDER ON SAID FIBERS TO FORM RUBBER-COATED FIBERS, ADDING TO THE RESULTING SLURRY A WATER-SOLUBLE SALT OF POLYACRYLIC ACID, PRECIPITATING SAID POLYACRYLIC ACID ON SAID COATED FIBERS, AND FORMING THE RESULTING SLURRY OF COATED FIBERS INTO A SHEET.
Claim 2
Independent Claim
65 words
THE METHOD OF INCREASING THE TENSILE STRENGTH OF A BEATER SATURATED SHEET, WHICH METHOD COMPRISES FORMING A SLURRY OF PAPERMAKING FIBERS IN WATER, DEPOSITING A SYNTHETIC RUBBER BINDER ON SAID FIBERS TO FORM RUBBER-COATED FIBERS, ADDING TO THE RESULTING SLURRY A WATER-SOLUBLE SALT OF POLYACRYLIC ACID, PRECIPITATING SAID POLYACRYLIC ACID ON SAID COATED FIBERS, AND FORMING THE RESULTING SLURRY OF COATED FIBERS INTO A SHEET.
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |