US3979285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of industrial effluents
Assignee: Novartis Corp
•
Filing: 1975-05-29
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Granted: 1976-09-07
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Expires: 1995-05-29
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
2026-10-27 18:02
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; C02F1/288; C02F1/52; C02F1/5263; C02F1/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A process for purifying industrial effluents containing residual substances consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents or tanning agents, which comprises bringing said effluents into contact with a cellulosic adsorbent which is pretreated with polyamidopolyamines produced by condensation from a polymeric fatty acid and a polyamine, to remove said substances.
Claim 2
Dependent Claim
51 words
A process for purifying industrial effluents containing residual substances consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents or tanning agents, which comprises bringing said effluents into contact with a cellulosic adsorbent which is pretreated with polyamidopolyamines produced by condensation from a polymeric fatty acid and a polyamine, to remove said substances.
Claim 3
Dependent Claim
18 words
Process according to claim 1 wherein the purification of the effluents is carried out at 30° to 130°C.
Claim 4
Dependent Claim
18 words
Process according to claim 1, wherein the effluents are passed over a cellulosic filter pretreated with said polyamidopolyamines.
Claim 5
Dependent Claim
34 words
Process according to claim 3, wherein the cellulosic filter is pretreated with a polyamide which has an amine value in the range of 200 to 650 milligrams of potassium hydroxide per gram of polyamide.
Claim 6
Dependent Claim
24 words
Process according to claim 3, wherein the cellulosic filter is pretreated with a mixture of said polyamidopolyamines and a salt of a polyvalent metal.
Claim 7
Dependent Claim
34 words
Process according to claim 5, wherein the cellulosic filter is pretreated with a mixture produced from said polyamidopolyamines and a salt of a polyvalent metal in the presence of an inorganic or organic base.
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Cited
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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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |