Patent US2521318A successfully refreshed from Google Patents.
US2521318A
Expired / Lapsed
US
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Ddt suspension
Assignee: Velsicol Chemical LLC
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Filing: 1947-03-27
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Granted: 1950-09-05
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Expires: 1967-03-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Wohlers
- 👤 Thomas C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:15
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/02; A01N25/04; A01N25/30; A01N65/00; A01N2300/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
IN A METHOD FOR THE PREPARATION OF A WATERDISPERSIBLE PARASITICIDAL CONCENTRATE, THE STEPS WHICH INCLUDE: MELTING DDT IN QUANTITY AT LEAST ABOUT 37 PERCENT BY WEIGHT OF THE TOTAL CONCENTRATE, AND EMULSIFYING AGENT WHICH IS A NON-IONIC ETHER-TYPE AGENT, CONTAINING ETHER GROUPS AS THE HYDROPHYLIC PART OF THE MOLECULE, AND, IF HYDROXYL GROUPS ARE PRESENT, AT LEAST ONE ETHER GROUP PER HYDROXYL GROUP, AND OIL IN A QUANTITY NOT LESS THAN ABOUT 37 PERCENT BY WEIGHT OF THE DDT, AT LEAST A PORTION OF SAID OIL BEING A DDT SOLVENT OIL, THE COMBINED DDT AND OIL REPRESENTING FROM ABOUT 50 TO 75 PERCENT BY WEIGHT OF THE TOTAL CONCENTRATE, MIXING THE LIQUID MIXTURE WITH AGITATION WITH FROM ABOUT 25 TO 50 PERCENT OF WATER BY WEIGHT OF THE TOTAL CONCENTRATE, SAID WATER BEING AT A TEMPERATURE ABOVE ABOUT 90 DEGREES CENTIGRADE, AND COLLOIDIZING AND COOLING THE EMULSION THUS PRODUCED TO FORM A SUSPENSION OF SOLID DDT PARTICLES.
Claim 2
Dependent Claim
157 words
IN A METHOD FOR THE PREPARATION OF A WATERDISPERSIBLE PARASITICIDAL CONCENTRATE, THE STEPS WHICH INCLUDE: MELTING DDT IN QUANTITY AT LEAST ABOUT 37 PERCENT BY WEIGHT OF THE TOTAL CONCENTRATE, AND EMULSIFYING AGENT WHICH IS A NON-IONIC ETHER-TYPE AGENT, CONTAINING ETHER GROUPS AS THE HYDROPHYLIC PART OF THE MOLECULE, AND, IF HYDROXYL GROUPS ARE PRESENT, AT LEAST ONE ETHER GROUP PER HYDROXYL GROUP, AND OIL IN A QUANTITY NOT LESS THAN ABOUT 37 PERCENT BY WEIGHT OF THE DDT, AT LEAST A PORTION OF SAID OIL BEING A DDT SOLVENT OIL, THE COMBINED DDT AND OIL REPRESENTING FROM ABOUT 50 TO 75 PERCENT BY WEIGHT OF THE TOTAL CONCENTRATE, MIXING THE LIQUID MIXTURE WITH AGITATION WITH FROM ABOUT 25 TO 50 PERCENT OF WATER BY WEIGHT OF THE TOTAL CONCENTRATE, SAID WATER BEING AT A TEMPERATURE ABOVE ABOUT 90 DEGREES CENTIGRADE, AND COLLOIDIZING AND COOLING THE EMULSION THUS PRODUCED TO FORM A SUSPENSION OF SOLID DDT PARTICLES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |