Patent DE2008010A1 successfully refreshed from Google Patents.
US3022279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making hydrolyzed polyacrylamide
Assignee: Dow Chemical Co
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Filing: 1959-05-06
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Granted: 1962-02-20
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Expires: 1979-05-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Proffitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:52
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD FOR PRODUCING HIGH MOLECULAR WEIGHT WATER-SOLUBLE HYDROLYZED POLYACRYLAMIDE WHICH COMPRISES THE STEPS OF FORMING A HOMOGENEOUS AQUEOUS SOLUTION CONTAINING AT LEAST ABOUT 5 PERCENT BY WEIGHT OF ACRYLAMIDE AS SUBSTANTIALLY THE SOLE POLYMERIZABLE INGREDIENT AND SODIUM CARBONATE IN THE AMOUNT OF FROM ABOUT 0.1 TO ABOUT 0.67 MOLE PER MOLE OF ACRYLAMIDE IN THE REACTION MIXTURE, INTRODUCING INTO SAID SOLUTION A POLYMERIZATION CATALYST CAPABLE OF PRODUCING FREE RADICALS AND INITIATING POLYMERIZATION AT A TEMPERATURE OF FROM ABOUT 20* TO 55*C. TO PRODUCE A SUBSTANTIALLY HOMOGENEOUS WATERSOLUBLE POLYMER PRODUCT.
Claim 2
Independent Claim
90 words
A METHOD FOR PRODUCING HIGH MOLECULAR WEIGHT WATER-SOLUBLE HYDROLYZED POLYACRYLAMIDE WHICH COMPRISES THE STEPS OF FORMING A HOMOGENEOUS AQUEOUS SOLUTION CONTAINING AT LEAST ABOUT 5 PERCENT BY WEIGHT OF ACRYLAMIDE AS SUBSTANTIALLY THE SOLE POLYMERIZABLE INGREDIENT AND SODIUM CARBONATE IN THE AMOUNT OF FROM ABOUT 0.1 TO ABOUT 0.67 MOLE PER MOLE OF ACRYLAMIDE IN THE REACTION MIXTURE, INTRODUCING INTO SAID SOLUTION A POLYMERIZATION CATALYST CAPABLE OF PRODUCING FREE RADICALS AND INITIATING POLYMERIZATION AT A TEMPERATURE OF FROM ABOUT 20* TO 55*C. TO PRODUCE A SUBSTANTIALLY HOMOGENEOUS WATERSOLUBLE POLYMER PRODUCT.
References Cited (Backward Citations)
US2625537A
Cited
US2878237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |