Patent US3894945A successfully refreshed from Google Patents.
US3894945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for raw water clarification
Assignee: Wyeth Holdings LLC
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Filing: 1974-02-25
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Granted: 1975-07-15
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Expires: 1994-02-25
Abstract
Abstract Raw water is clarified when it is treated with an effective amount of a polyquaternary flocculant obtained from the reaction of an epoxy compound with a major amount of a secondary amine and a minor amount of a polyamine.
Inventors
- 👤 Hans Peter Panzer
- 👤 Kenneth Wayne Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:37
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/0226
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A PROCESS FOR CLARIFYING RAW WATER BY SEDIMENTATION OF SOLIDS BY ACTION OF A QUICK-ACTING FLOCCULANT WHICH PROCESS COMPRISES TREATING SAID WATER WITH AN EFFECTIVE AMOUNT OF A WATER-DISPERSIBLE POLYQUATERNARY COMPRISING THE REACTION PRODUCT OF DIMETHYLAMINE, A POLYFUNCTIONAL AMINE, AND A DIFUNCTIONAL EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF EPIHALOHYDRINS AND PRECURSORS FOR EPIHALOHYDRINS WHICH UNDER ALKALINE CONDITIONS ARE READILY CONVERTED INTO THE CORRESPONDING EPOXY COMPOUNDS, AND MIXTURES THEREOF, SAID POLYQUATERNARY POLYMER CONTAINING REPEATING UNITS OF THE STRUCTURES
Claim 2
Dependent Claim
79 words
A PROCESS FOR CLARIFYING RAW WATER BY SEDIMENTATION OF SOLIDS BY ACTION OF A QUICK-ACTING FLOCCULANT WHICH PROCESS COMPRISES TREATING SAID WATER WITH AN EFFECTIVE AMOUNT OF A WATER-DISPERSIBLE POLYQUATERNARY COMPRISING THE REACTION PRODUCT OF DIMETHYLAMINE, A POLYFUNCTIONAL AMINE, AND A DIFUNCTIONAL EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF EPIHALOHYDRINS AND PRECURSORS FOR EPIHALOHYDRINS WHICH UNDER ALKALINE CONDITIONS ARE READILY CONVERTED INTO THE CORRESPONDING EPOXY COMPOUNDS, AND MIXTURES THEREOF, SAID POLYQUATERNARY POLYMER CONTAINING REPEATING UNITS OF THE STRUCTURES
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the viscosity of said polyquaternary polymer is at least 200 centistokes.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the viscosity of said polyquaternary is 1,000 centistokes.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said raw water is a river water.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said raw water is a lake water.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the polyfunctional amine is ethylenediamine.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the epoxy compound is epichlorohydrin.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |