US3398092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification process
Assignee: Monsanto Co
•
Filing: 1965-03-18
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Granted: 1968-08-20
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Expires: 1985-03-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Fields
- 👤 John H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:45
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; B; B01; B01J; B01J20/00; B01J20/22; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C02F1/50; C02F1/52; C02F1/54; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR PURIFYING WATER BY SELECTIVELY REDUCING THE CONCENTRATION OF AT LEAST ONE OF THE GROUPS OF VIRUSES, COLIFORM BACTERIA, OTHER MICROORGANISMS, AND SURFACE ACTIVE AGENTS IN WATER COMPRISING CONTACTING THE WATER WITH A HYDROPHILIC, WATER-INSOLUBLE, CROSS-LINKED POLYAMPHOLYTE DERIVED FROM A COPOLYMER OF AN OLEFIN OF 2 TO 12 CARBON ATOMS AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF (1) A MIXTURE OF AN UNSATURATED POLYCARBOXYLIC ACID AND AN UNSATURATED POLYCARBOXYLIC ACID DERIVATIVE, AND (2) POLYCARBOXYLIC ACID DERIVATIVES.
Claim 2
Dependent Claim
80 words
A PROCESS FOR PURIFYING WATER BY SELECTIVELY REDUCING THE CONCENTRATION OF AT LEAST ONE OF THE GROUPS OF VIRUSES, COLIFORM BACTERIA, OTHER MICROORGANISMS, AND SURFACE ACTIVE AGENTS IN WATER COMPRISING CONTACTING THE WATER WITH A HYDROPHILIC, WATER-INSOLUBLE, CROSS-LINKED POLYAMPHOLYTE DERIVED FROM A COPOLYMER OF AN OLEFIN OF 2 TO 12 CARBON ATOMS AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF (1) A MIXTURE OF AN UNSATURATED POLYCARBOXYLIC ACID AND AN UNSATURATED POLYCARBOXYLIC ACID DERIVATIVE, AND (2) POLYCARBOXYLIC ACID DERIVATIVES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |