US3701728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification system
Assignee: LUCILLE E APPLEMAN
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Filing: 1970-05-22
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Granted: 1972-10-31
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Expires: 1990-05-22
Abstract
Abstract A METHOD OF PURIFYING WATER WHICH COMPRISES INTRODUCING BACTERIACIDAL CHLORINE DIRECTLY INTO, OR JUST PRIOR TO PURIFICATION MEDIA FOR SAID WATER AT CONCENTRATIONS SUBSTANTIALLY ABOVE POTABLE LIMITS SO THAT ESSENTIALLY ALL OF THE CHLORINE IS AVAILABLE FOR REACTION TO KILL MICROORGANISMS TRAPPED IN SAID PURIFICATION MATERIAL.
Inventors
- 👤 Milo Don Appleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C02F1/4674; B; B01; B01J; B01J49/00; B01J49/60; C02F1/28; C02F1/283; C02F1/42; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4612; C02F2201/4615; C02F2201/4616; C02F2201/4617; C02F2303/00; C02F2303/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |