Patent US2060235A successfully refreshed from Google Patents.
US3323979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the drainage rate in forming paper by incorporating a reaction product of polyacrylamide, formaldehyde and dialkylamine in the furnish
Assignee: Dow Chemical Co
•
Filing: 1964-09-24
•
Granted: 1967-06-06
•
Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 William A Foster
- 👤 Joyce E Stout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A METHOD FOR MANUFACTURING PAPER WHICH COMPRISES WET LAYING AN ACIDIC FIBER FURNISH TO FORM PAPER, THE IMPROVEMENT WHICH CONSISTS IN INCORPORATING INTO THE FURNISH FROM ABOUT 0.01 UP TO ABOUT 0.3 PERCENT BY WEIGHT, BASED ON THE FIBER CONTENT OF THE FURNISH, OF A WATER SOLUBLE, ESSENTIALLY LINEAR, HIGHER MOLECULAR WEIGHT POLYMER CORRESPONDING TO A VINYL POLYMERIZATION PRODUCT OF MONOETHYLENICALLY UNSATURATED MONOMERS IN WHICH AT LEAST ABOUT 5 MOLE PERCENT OF THE COMBINED MERS IS A MONOMER UNIT HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
84 words
IN A METHOD FOR MANUFACTURING PAPER WHICH COMPRISES WET LAYING AN ACIDIC FIBER FURNISH TO FORM PAPER, THE IMPROVEMENT WHICH CONSISTS IN INCORPORATING INTO THE FURNISH FROM ABOUT 0.01 UP TO ABOUT 0.3 PERCENT BY WEIGHT, BASED ON THE FIBER CONTENT OF THE FURNISH, OF A WATER SOLUBLE, ESSENTIALLY LINEAR, HIGHER MOLECULAR WEIGHT POLYMER CORRESPONDING TO A VINYL POLYMERIZATION PRODUCT OF MONOETHYLENICALLY UNSATURATED MONOMERS IN WHICH AT LEAST ABOUT 5 MOLE PERCENT OF THE COMBINED MERS IS A MONOMER UNIT HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US2328901A
Cited
US2884057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |