US2959514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry strength paper
Assignee: Wyeth Holdings LLC
•
Filing: 1958-02-17
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Granted: 1960-11-08
•
Expires: 1978-02-17
Abstract
No abstract record available.
Inventors
- 👤 Norman T Woodberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:01
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
PROCESS FOR THE MANUFACTURE OF PAPER OF SUBSTANTIALLY IMPROVED DRY STRENGTH BUT OF LOW WET STRENGTH WHICH COMPRISES FORMING AN AQUEOUS SUSPENSION OF PAPERMAKING CELLULOSIC FIBERS, ADDING THERETO BETWEEN ABOUT 0.1% TO 5%, BASED ON THE DRY WEIGHT OF THE FIBERS, OF A WATER-SOLUBLE AMPHOLYTIC LINER CARBON CHAIN VINYL POLYMER SUBSTANTIALLY COMPOSED OF RECURRING HYDROXYAMIDINOETHYLENE AND CARBAMYLETHYLENE LINKAGES THE RATIO BETWEEN SAID LINKAGES BEING BETWEEN ABOUT 1:100 AND 10:1, SAID POLYMER HAVING A MOLECULAR WEIGHT IN EXCESS OF 100,000 WHEREBY SAID POLYMER IS ADSORBED ON SAID FIBERS, SHEETING SAID FIBERS TO FORM A CELLULOSIC WEB, AND HEATING SAID WEB UNTIL DRY AT A TEMPERATURE BETWEEN 190*F. AND 250*F.
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) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |