US4026796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of industrial effluents
Assignee: Novartis Corp
•
Filing: 1976-05-27
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Granted: 1977-05-31
•
Expires: 1996-05-27
Abstract
Abstract A novel process for purifying industrial effluents which comprises bringing said effluents into contact with cellulosic absorbent which has been pretreated with precipitants.
Inventors
- 👤 Hans Wegmuller
- 👤 Jaroslav Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; C02F1/52; C02F1/5263; C02F1/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A process for purifying industrial effluents containing residual substances consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents, tanning agents or mixtures thereof, which comprises bringing said effluents into contact with a cellulosic absorbent pretreated with a water soluble basic aminoplast which is a condensation product of formaldehyde, dicyandiamide and urea or of formaldehyde, decyandiamide and an alkylenepolyamine with 2 to 12 carbon atoms and 2 to 5 amino groups.
Claim 2
Dependent Claim
69 words
A process for purifying industrial effluents containing residual substances consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents, tanning agents or mixtures thereof, which comprises bringing said effluents into contact with a cellulosic absorbent pretreated with a water soluble basic aminoplast which is a condensation product of formaldehyde, dicyandiamide and urea or of formaldehyde, decyandiamide and an alkylenepolyamine with 2 to 12 carbon atoms and 2 to 5 amino groups.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the cellulosic absorbent is impregnated with a formaldehyde-dicyandiamide-ethylenediamine condensation product.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the cellulosic filter is impregnated with a formaldehyde-dicyandiamide-urea condensation product.
Claim 5
Dependent Claim
26 words
A process according to claim 1, wherein the cellulosic absorbent is pretreated with a mixture of said condensation product and a salt of a polyvalent metal.
Claim 6
Dependent Claim
35 words
A process according to claim 4, wherein the cellulosic absorbent is pretreated with a mixture of said condensation product and a salt of a polyvalent metal in the presence of an inorganic or organic base.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |