US3573263A
Expired / Lapsed
US
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Polymerization with a redox and azoisobutyronitrile catalyst
Assignee: Individual
•
Filing: 1967-07-03
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Granted: 1971-03-30
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Expires: 1987-07-03
Abstract
Abstract A METHOD OF MANUFACTURING WATER-SOLUBLE, VERY HIGH MOLECULAR WEIGHT SYNTHETIC POLYMERS, E.G. POLY(ACRYLIC ACID), BY POLYMERIZING THE MONOMER OR MONOMERS IN AQUEOUS SOLUTION USING A POLYMERIZATION INITIATOR COMPRISING A REDOX SYSTEM, FOR EXAMPLE POTASSIUM PERSULPHATE/ SODIUM SULPHITE, AND AN AZO COMPOUND FREE-RADICAL SOURCE, FOR EXAMPLE AZOBISISOBUTYRONITRILE.
Inventors
- 👤 Edward Arthur Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/28; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; C08F4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |