Patent US3090761A successfully refreshed from Google Patents.
US3090761A
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Process for preparing a foamed solution of polyacrylamide employing co2 and product produced thereby
Assignee: Wyeth Holdings LLC
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Filing: 1959-06-24
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Granted: 1963-05-21
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Expires: 1979-06-24
Abstract
No abstract record available.
Inventors
- 👤 Gerald R Backlund
- 👤 Joseph F Terenzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08J2333/00; C08J2333/24; C08J2333/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS COMPRISING SATURATING AN AQUEOUS MONOMERIC ACRYLAMIDE SOLUTION, CONTAINING FROM ABOUT 7% TO ABOUT 12% OF SAID MONOMER, WITH CARBON DIOXIDE GAS, INTRODUCING, INTO SAID GAS-SATURATED SOLUTION OF A FREE RADICAL POLYMERIZATION CATALYST AND ADIABATICALLY POLYMERIZING SAID ACRYLAMIDE AT A TEMPERATURE BELOW ABOUT 20* C. WHILE CONTINUING TO MAINTAIN THE SOLUTION IN A CARBON DIOXIDE GAS SATURATED STATE THEREBY PRODUCING A FOAMED POLYMERIC SOLUTION OF INCREASED MOBILITY HAVING AN INTRINSIC VISCOSITY OF AT LEAST 12 DECILITERS PER GRAM.
Claim 2
Dependent Claim
79 words
A PROCESS COMPRISING SATURATING AN AQUEOUS MONOMERIC ACRYLAMIDE SOLUTION, CONTAINING FROM ABOUT 7% TO ABOUT 12% OF SAID MONOMER, WITH CARBON DIOXIDE GAS, INTRODUCING, INTO SAID GAS-SATURATED SOLUTION OF A FREE RADICAL POLYMERIZATION CATALYST AND ADIABATICALLY POLYMERIZING SAID ACRYLAMIDE AT A TEMPERATURE BELOW ABOUT 20* C. WHILE CONTINUING TO MAINTAIN THE SOLUTION IN A CARBON DIOXIDE GAS SATURATED STATE THEREBY PRODUCING A FOAMED POLYMERIC SOLUTION OF INCREASED MOBILITY HAVING AN INTRINSIC VISCOSITY OF AT LEAST 12 DECILITERS PER GRAM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |