Patent US3894947A successfully refreshed from Google Patents.
US3894947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating industrial wastes
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 Treatment of flocculatable industrial wastes with effective amounts of polyquaternary polymers obtained by reaction of a difunctional epoxy type reactant with a secondary amine to a solution viscosity above a minimum value provides improved processing of the wastes.
Inventors
- 👤 Hans Peter Panzer
- 👤 Kenneth Wayne Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:33
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/0226; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A PROCESS FOR FLOCCULATING FLOCCULATABLE INDUSTRIAL WASTES WHICH ARE IN THE FORM OF AQUEOUS DISPERSION HAVING NEGATIVE CHARGES WHICH PROCESS COMPRISES ADDING TO THE DISPERSION AN EFFECTIVE AMOUNT OF A WATER-DISPERSIBLE POLYQUATERNARY POLYMER OF ESSENTIALLY LINEAR STRUCTURE COMPRISING THE DIFUNCTIONAL REACTION PRODUCT OF DIMETHYLAMINE AND A DIFUNCTIONAL EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF EPIHALOHYDRINS AND PRECURSORS OF EPIHALOHYDRINS WHICH UNDER ALKALINE CONDITIONS ARE READILY CONVERTED INTO THE CORRESPONDING EPOXY COMPOUNDS, AND MIXTURES THEREOF, SAID POLYQUATERNARY POLYMER CONTAINING REPEATING UNITS OF
Claim 2
Dependent Claim
82 words
A PROCESS FOR FLOCCULATING FLOCCULATABLE INDUSTRIAL WASTES WHICH ARE IN THE FORM OF AQUEOUS DISPERSION HAVING NEGATIVE CHARGES WHICH PROCESS COMPRISES ADDING TO THE DISPERSION AN EFFECTIVE AMOUNT OF A WATER-DISPERSIBLE POLYQUATERNARY POLYMER OF ESSENTIALLY LINEAR STRUCTURE COMPRISING THE DIFUNCTIONAL REACTION PRODUCT OF DIMETHYLAMINE AND A DIFUNCTIONAL EPOXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF EPIHALOHYDRINS AND PRECURSORS OF EPIHALOHYDRINS WHICH UNDER ALKALINE CONDITIONS ARE READILY CONVERTED INTO THE CORRESPONDING EPOXY COMPOUNDS, AND MIXTURES THEREOF, SAID POLYQUATERNARY POLYMER CONTAINING REPEATING UNITS OF
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the solution viscosity is at least 150 centistokes.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the solution viscosity is at least 200 centistokes.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the industrial waste is an iron ore slime.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the industrial waste is a coal washing.
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 |