Patent US5281852A successfully refreshed from Google Patents.
Patent US3076740A successfully refreshed from Google Patents.
US3076740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos paper manufacture
Assignee: Wyeth Holdings LLC
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Filing: 1960-09-23
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Granted: 1963-02-05
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter F Reynolds
- 👤 Norman T Woodberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A PROCESS OF INDREASING THE RATE AT WHICH WATER DRAINS FROM THE FIBERS DURING THE MANUFACTURE OF ASBESTOS PAPER WHICH COMPRISES ADDING TO AN EQUEOUS PAPERMAKING ASBESTOS FIBER SUSPENSION A WATER-SOLUBLE ANIONIC LINEAR CARBON CHAIN POLYMER HAVING A MOLECULAR WEIGHT IN EXCESS OF 5 MILLION AS CALCULATED FROM ITS INTRINSIC VISCOSITY BY MODIFIED STAUDINGER EQUATION AND SUBSTANTIALLY COMPOSED OF CARBAMOYLALKYLENE AND CARBOXYALKYLENE LINKAGES CONTAINING NOT MORE THAN 4 CARBON ATOMS ECH, THE NUMBER OF SAID CARRBOXYALKYLENE LINKAGES BEING BETWEEN ABOUT 2% AND 20% OF THE TOTAL NUMBER OF CARBAMOYLALKYLENE AND CARBOXYALKYLENE LINKAGES, SHEETING SAID SUSPENSION ON A PAPERMAKING SCREEN TO FORM A WATER-LAID WEB, DRAINING FREE WATER FROM SAID WEB, AND DRYING SAID WEB TO FORM PAPER, THE AMOUNT OF SAID COMPLEX BEING SUFFICIENT TO INCREASE THE RATE AT WHICH FREE WATER DRAINS THROUGH SAID WEB AND BEING INSUFFICIENT TO DECREASE SUBSTANTIALLY THE DRY TENSILE STRENGTH OF THE PAPER.
Claim 2
Dependent Claim
149 words
A PROCESS OF INDREASING THE RATE AT WHICH WATER DRAINS FROM THE FIBERS DURING THE MANUFACTURE OF ASBESTOS PAPER WHICH COMPRISES ADDING TO AN EQUEOUS PAPERMAKING ASBESTOS FIBER SUSPENSION A WATER-SOLUBLE ANIONIC LINEAR CARBON CHAIN POLYMER HAVING A MOLECULAR WEIGHT IN EXCESS OF 5 MILLION AS CALCULATED FROM ITS INTRINSIC VISCOSITY BY MODIFIED STAUDINGER EQUATION AND SUBSTANTIALLY COMPOSED OF CARBAMOYLALKYLENE AND CARBOXYALKYLENE LINKAGES CONTAINING NOT MORE THAN 4 CARBON ATOMS ECH, THE NUMBER OF SAID CARRBOXYALKYLENE LINKAGES BEING BETWEEN ABOUT 2% AND 20% OF THE TOTAL NUMBER OF CARBAMOYLALKYLENE AND CARBOXYALKYLENE LINKAGES, SHEETING SAID SUSPENSION ON A PAPERMAKING SCREEN TO FORM A WATER-LAID WEB, DRAINING FREE WATER FROM SAID WEB, AND DRYING SAID WEB TO FORM PAPER, THE AMOUNT OF SAID COMPLEX BEING SUFFICIENT TO INCREASE THE RATE AT WHICH FREE WATER DRAINS THROUGH SAID WEB AND BEING INSUFFICIENT TO DECREASE SUBSTANTIALLY THE DRY TENSILE STRENGTH OF THE PAPER.
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) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |