US3201304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flocculation of cellulose fiber slurries with acrylamide copolymer
Assignee: EF Houghton and Co
•
Filing: 1961-02-16
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Granted: 1965-08-17
•
Expires: 1981-02-16
Abstract
No abstract record available.
Inventors
- 👤 Francis S Munjat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; D21H17/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A COMPOSITION OF MATTER COMPRISING PAPER STOCK, A PIGMENT AND A FLOCCULANT ESSENTIALLY CONSISTING OF A COPOLYMER IN WATER, SAID COPOLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE BETWEEN 250,000 AND 2,000,000 SAID COPOLYMER BEING THE COPOLYMER FORMED IN WATER OF BETWEEN 40 AND 95% OF A WATER SOLUBLE ACRYLAMIDE HAVING THE FORMULA:
Claim 2
Dependent Claim
53 words
A COMPOSITION OF MATTER COMPRISING PAPER STOCK, A PIGMENT AND A FLOCCULANT ESSENTIALLY CONSISTING OF A COPOLYMER IN WATER, SAID COPOLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE BETWEEN 250,000 AND 2,000,000 SAID COPOLYMER BEING THE COPOLYMER FORMED IN WATER OF BETWEEN 40 AND 95% OF A WATER SOLUBLE ACRYLAMIDE HAVING THE FORMULA:
References Cited (Backward Citations)
US2625471A
Cited
US3033782A
Cited
FR1238574A
Cited
GB883973A
Cited
US3019157A
Cited
US3076740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |