US3619201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pesticide decontamination of animal feed and foods
Assignee: University of California Berkeley
•
Filing: 1967-10-24
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Granted: 1971-11-09
•
Expires: 1987-10-24
Abstract
Abstract Reduction and elimination of agricultural chemicals whose permanent presence is undesirable in plant materials. The process involves one or more steps including (1) chemical destruction of agricultural chemical residues by treatment with hot alkalialkanol wash, (2) wash of plant materials with solvent vapor, and (3) rapid dehydration of plant materials having a relatively high water content.
Inventors
- 👤 Thomas E Archer
- 👤 Donald G Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:45
CPC Classifications
A; A23; A23L; A23L5/00; A23L5/20; A23L5/27; A23L5/23; A23L5/57
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
24 words
A method in accordance with claim 1 wherein said dehydration is executed by exposing the feed to said elevated temperature for about 2-5 minutes.
Claim 2
Dependent Claim
22 words
A method in accordance with claim 1 wherein sufficient water is combined with said feed to saturate the feed before said dehydration.
Claim 3
Dependent Claim
60 words
A method in accordance with claim 1 and including the steps, prior to said dehydration, of applying aqueous alkali at an elevated temperature, and then washing the feed with water to remove alkali therefrom, said steps serving to leave a water content in said feed of at least of about 75 percent by weight in preparation for said dehydration step.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 4 wherein said aqueous alkali includes a lower alkanol in combination therewith and the aqueous alkali pH is at least about 9.
Claim 5
Dependent Claim
21 words
A method in accordance with claim 5 wherein said alkanol comprises about 50-95 percent by weight of the aqueous alkali-alkanol combination.
Claim 6
Dependent Claim
116 words
A method in accordance with claim 1 and including the steps, prior to said dehydration, of flowing a preselected volume of carrier gas in contact with said feed while maintaining substantially all of said carrier gas during said contact in the gas phase, said carrier gas selected from the group consisting of water vapor and organic solvent vapors, flowing the carrier gas out of contact with said feed, maintaining said carrier gas at least during said contact at a temperature at which the pesticide contamination on said feed has an appreciable vapor pressure, the flow of said carrier gas out of contact with said feed, thereby including vaporized pesticide and reducing the contamination of said feed.
Claim 7
Dependent Claim
31 words
A method in accordance with claim 7 wherein the volume of said carrier gas is preselected to cause at least a 50 percent reduction in the pesticide concentration in said feed.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 8 wherein said carrier gas volume is approximately 20 litres per kilogram of feed.
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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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |