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Patent US3951731A successfully refreshed from Google Patents.
US3951731A
Expired / Lapsed
US
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Process for aerobic decomposition and solvent treatment of waste material
Assignee: Jetzer Engineering AG
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Filing: 1973-11-29
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Granted: 1976-04-20
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Expires: 1993-11-29
Abstract
Abstract In a process for the production of fiber substances from waste which contains aerobically unstable components, the waste is subjected to aerobic decomposition at a temperature of at least 50°C in the presence of oxygen to form a fibrous mass and then the mass is treated with solvents which dissolve these components. This eliminates the odor characteristic of fiber substances produced from waste. An arrangement for carrying out the process is also disclosed.
Inventors
- 👤 Raimund Jetzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:20
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/06; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y10; Y10S; Y10S241/00; Y10S241/38
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
A process for recovering fibrous materials from waste, comprising subjecting a quantity of waste which contains aerobically unstable components to aerobic decomposition by maintaining said waste at a temperature of at least about 50° C in the presence of oxygen until said aerobically unstable components are aerobically decomposed to a great extent and aerobically semi-stable components are also partially aerobically decomposed to thereby obtain a fibrous mass; contacting at least a portion of the mass with at least one solvent which is capable of dissolving the still undecomposed aerobically unstable components remaining in said mass so that said undecomposed aerobically unstable components are dissolved; and removing said solvent containing the dissolved undecomposed aerobically unstable components from said portion of said mass so as to recover a fibrous material the odor of which is reduced due to the aerobic decomposition and dissolution of said aerobically unstable components.
Claim 2
Dependent Claim
146 words
A process for recovering fibrous materials from waste, comprising subjecting a quantity of waste which contains aerobically unstable components to aerobic decomposition by maintaining said waste at a temperature of at least about 50° C in the presence of oxygen until said aerobically unstable components are aerobically decomposed to a great extent and aerobically semi-stable components are also partially aerobically decomposed to thereby obtain a fibrous mass; contacting at least a portion of the mass with at least one solvent which is capable of dissolving the still undecomposed aerobically unstable components remaining in said mass so that said undecomposed aerobically unstable components are dissolved; and removing said solvent containing the dissolved undecomposed aerobically unstable components from said portion of said mass so as to recover a fibrous material the odor of which is reduced due to the aerobic decomposition and dissolution of said aerobically unstable components.
Claim 3
Dependent Claim
22 words
A process as defined in claim 1; and further comprising the step of comminuting said waste prior to the aerobic decomposition step.
Claim 4
Dependent Claim
30 words
A process as defined in claim 1; and further comprising the step of heating said portion to a temperature in excess of approximately 100° C prior to the contacting step.
Claim 5
Dependent Claim
13 words
A process as defined in claim 1, wherein said one solvent comprises water.
Claim 6
Dependent Claim
13 words
A process as defined in claim 1, wherein said one solvent comprises alcohol.
Claim 7
Dependent Claim
15 words
A process as defined in claim 1, wherein said one solvent comprises a degreasing agent.
Claim 8
Dependent Claim
14 words
A process as defined in claim 1, wherein said one solvent comprises an emulsifier.
Claim 9
Dependent Claim
13 words
A process as defined in claim 7, wherein said emulsifier comprises a surfactant.
Claim 10
Dependent Claim
33 words
A process as defined in claim 1, wherein said portion is contacted with an additional solvent subsequent to being contacted with said one solvent, said additional solvent being different from said one solvent.
Claim 11
Dependent Claim
34 words
A process as defined in claim 9, wherein one of said solvents comprises a degreasing agent, and the other of said solvents includes a substance selected from the group consisting of water and alcohol.
Claim 12
Dependent Claim
14 words
A process as defined in claim 10, wherein said other solvent comprises an emulsifier.
Claim 13
Dependent Claim
13 words
A process as defined in claim 11, wherein said emulsifier comprises a surfactant.
Claim 14
Dependent Claim
19 words
A process as defined in claim 1, wherein the removing step comprises drying said portion of said fibrous mass.
Claim 15
Dependent Claim
28 words
A process as defined in claim 1, wherein the removing step comprises heating said portion of said fibrous mass to a temperature in excess of approximately 100° C.
Claim 16
Dependent Claim
24 words
A process as defined in claim 1, and further comprising the step of comminuting part of said fibrous mass prior to the contacting step.
References Cited (Backward Citations)
US2077059A
Cited
US2166540A
Cited
US2709133A
Cited
US3253976A
Cited
US3597308A
Cited
US3595741A
Cited
US3736223A
Cited
US3849246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |