Patent US2029922A successfully refreshed from Google Patents.
Patent US3759857A successfully refreshed from Google Patents.
US3759857A
Expired / Lapsed
US
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Cross linking of acrylamide polymers
Assignee: Labofina SA
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Filing: 1971-06-18
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Granted: 1973-09-18
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Expires: 1991-06-18
Abstract
Abstract A PROCESS FOR THE CROSS-LINKING OF POLYMERS OF ACRYLAMIDE COMPRISING TREATING AN AQUEOUS SOLUTION OF SAID POLYMERS AT A TEMPERATURE OF FROM 0*C. TO 100*C. WITH AN AQUEOUS SOLUTION OF A SALT SELECTED FROM THE GROUP CONSISTING OF THE HYPOCHLORITE AND HYPOBROMITE SALTS OF ALKALI METALS AND ALKALINE-EARTH METALS.
Inventors
- 👤 W Bracke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:10
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; C09K17/48; C08; C08K; C08K3/00; C08K3/16; C08K3/18; C08K3/24; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S106/00; Y10S106/90; Y10S106/901; Y10S111/00; Y10S111/915; Y10S111/917; Y10S260/00; Y10S260/31; Y10S524/00; Y10S524/916
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |