Patent US3272690A successfully refreshed from Google Patents.
US3272690A
Expired / Lapsed
US
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Method of improving the wet strength of paper by addition of ethylene-vinyl acetate copolymer thereto
Assignee: ConocoPhillips Co
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Filing: 1963-06-26
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Granted: 1966-09-13
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Expires: 1983-06-26
Abstract
No abstract record available.
Inventors
- 👤 Anna M Shadan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:20
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/36; D21H17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF IMPROVING THE WET STRENGTH OF PAPER WHICH COMPRISES MIXING WITH THE PAPER PULP WHICH IS TO BE USED FOR MAKING SAID PAPER AN EMULSION COMPOSITION COMPRISING WATER, AN EMULSIFYING AGENT AND FROM ABOUT 0.25 PERCENT BY WEIGHT TO ABOUT 40 PERCENT BY WEIGHT, BASED ON THE DRY PULP, OF A WAX-COPOLYMER MIXTURE COMPRISING FROM ABOUT 50 PARTS BY WEIGHT TO ABOUT 99 PARTS BY WEIGHT WAX AND FROM ABOUT 1 PART BY WEIGHT TO ABOUT 50 PARTS BY WEIGHT OF AN ETHYLENE-VINYL ACETATE COPOLYMER CONTAINING FROM ABOUT 10 PERCENT BY WEIGHT TO ABOUT 40 PERCENT BY WEIGHT VINYL ACETATE AND HAVING A MELT INDEX OF FROM ABOUT 3 TO ABOUT 500, AND FORMING THE TREATED PAPER PULP THUS OBTAINED INTO PAPER.
Claim 2
Independent Claim
124 words
A METHOD OF IMPROVING THE WET STRENGTH OF PAPER WHICH COMPRISES MIXING WITH THE PAPER PULP WHICH IS TO BE USED FOR MAKING SAID PAPER AN EMULSION COMPOSITION COMPRISING WATER, AN EMULSIFYING AGENT AND FROM ABOUT 0.25 PERCENT BY WEIGHT TO ABOUT 40 PERCENT BY WEIGHT, BASED ON THE DRY PULP, OF A WAX-COPOLYMER MIXTURE COMPRISING FROM ABOUT 50 PARTS BY WEIGHT TO ABOUT 99 PARTS BY WEIGHT WAX AND FROM ABOUT 1 PART BY WEIGHT TO ABOUT 50 PARTS BY WEIGHT OF AN ETHYLENE-VINYL ACETATE COPOLYMER CONTAINING FROM ABOUT 10 PERCENT BY WEIGHT TO ABOUT 40 PERCENT BY WEIGHT VINYL ACETATE AND HAVING A MELT INDEX OF FROM ABOUT 3 TO ABOUT 500, AND FORMING THE TREATED PAPER PULP THUS OBTAINED INTO 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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |