US2831841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of acrylamide polymers
Assignee: Dow Chemical Co
•
Filing: 1956-03-19
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Granted: 1958-04-22
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Expires: 1976-03-19
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF TREATING A WATER-SOLUBLE ACRYLAMIDE POLYMER CONSISTING ESSENTIALLY OF AT LEAST 10 PERCENT BY WEIGHT OF ACRYLAMIDE CHEMICALLY COMBINED WITH FROM 0 TO 90 PERCENT BY WEIGHT OF AT LEAST ONE OTHER MONOETHYLENICALLY UNSATURATED ORGANIC COMPOUND COPOLYMERIZABLE THEREWITH AND HAVING AN APPRECIABLE AMOUNT OF MONOMERIC ACRYLAMIDE INTIMATELY ASSOCIATED THEREWITH, TO REDUCE THE AMOUNT OF MONOMERIC ACRYLAMIDE ASSOCIATED WITH THE POLYMER WHICH COMPRISES TREATING SAID ACRYLAMIDE POLYMER WITH AT LEAST ONE NITROGEN COMPOUND SELECTED FROM THE CLASS CONSISTING OF AMMONIA AND PRIMARY AND SECONDARY AMINES HAVING A SOLUBILITY OF AT LEAST 1 GRAM THEREOF IN 30 ML. OF WATER AT A TEMPERATURE OF 25*C.
Claim 2
Independent Claim
105 words
A METHOD OF TREATING A WATER-SOLUBLE ACRYLAMIDE POLYMER CONSISTING ESSENTIALLY OF AT LEAST 10 PERCENT BY WEIGHT OF ACRYLAMIDE CHEMICALLY COMBINED WITH FROM 0 TO 90 PERCENT BY WEIGHT OF AT LEAST ONE OTHER MONOETHYLENICALLY UNSATURATED ORGANIC COMPOUND COPOLYMERIZABLE THEREWITH AND HAVING AN APPRECIABLE AMOUNT OF MONOMERIC ACRYLAMIDE INTIMATELY ASSOCIATED THEREWITH, TO REDUCE THE AMOUNT OF MONOMERIC ACRYLAMIDE ASSOCIATED WITH THE POLYMER WHICH COMPRISES TREATING SAID ACRYLAMIDE POLYMER WITH AT LEAST ONE NITROGEN COMPOUND SELECTED FROM THE CLASS CONSISTING OF AMMONIA AND PRIMARY AND SECONDARY AMINES HAVING A SOLUBILITY OF AT LEAST 1 GRAM THEREOF IN 30 ML. OF WATER AT A TEMPERATURE OF 25*C.
References Cited (Backward Citations)
US2300566A
Cited
US2469696A
Cited
US2486190A
Cited
US2486192A
Cited
US2611763A
Cited
US2749331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |