Patent US3408292A successfully refreshed from Google Patents.
US3408292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water filtration process
Assignee: ChampionX LLC
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Filing: 1966-03-24
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Granted: 1968-10-29
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Expires: 1986-03-24
Abstract
No abstract record available.
Inventors
- 👤 Mahmoud T Dajani
- 👤 Thomas G Cocks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:08
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/56; C02F1/5236; C02F1/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD FOR FILTERING AQUEOUS LIQUIDS CONTAINING FINELY-DIVIDED SUSPENDED SOLIDS AND AT LEAST 0.1 P.P.M. OF RESIDUAL CHLORINE WHICH COMPRISES: ADDING TO SAID LIQUID AN AMOUNT OF A POLYMER WHICH CONTAINS A PLURALITY OF BASIC NITROGEN SITES IN FORM OF QUATERNARY GROUPS SUFFICIENT TO INCREASE THE RATE OF FILTRATION BUT INSUFFICIENT TO FORM A VISIBLE FLOC, AND THEREAFTER PASSING SAID LIQUID THROUGH A FILTERING MEDIUM SELECTED FROM THE GROUP CONSISTING OF SAND, ANTHRACITE COAL AND MIXTURES THEREOF.
Claim 2
Independent Claim
77 words
A METHOD FOR FILTERING AQUEOUS LIQUIDS CONTAINING FINELY-DIVIDED SUSPENDED SOLIDS AND AT LEAST 0.1 P.P.M. OF RESIDUAL CHLORINE WHICH COMPRISES: ADDING TO SAID LIQUID AN AMOUNT OF A POLYMER WHICH CONTAINS A PLURALITY OF BASIC NITROGEN SITES IN FORM OF QUATERNARY GROUPS SUFFICIENT TO INCREASE THE RATE OF FILTRATION BUT INSUFFICIENT TO FORM A VISIBLE FLOC, AND THEREAFTER PASSING SAID LIQUID THROUGH A FILTERING MEDIUM SELECTED FROM THE GROUP CONSISTING OF SAND, ANTHRACITE COAL AND MIXTURES THEREOF.
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |