US3042706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying pyrethrum extracts
Assignee: S B PENICK AND Co
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Filing: 1960-01-22
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Granted: 1962-07-03
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Expires: 1980-01-22
Abstract
No abstract record available.
Inventors
- 👤 Hans Joseph Benjamin
- 👤 Price Robert Wunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:22
CPC Classifications
A; A01; A01N; A01N65/00; A01N65/08; A01N65/12; A01N53/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE PROCESS FOR PURIFYING CRUDE PYRETHRUM EXTRACTS WHICH COMPRISES MIXING A CRUDE EXTRACTS CONTAINING PYRETHRINS WITH ABOUT 95 PERCENT AQUEOUS METHYL ALCOHOL SEPARATING THE ALCOHOL LAYER, REMOVING THEREFROM METHYL ALCOHOL AND WATER BY DISTILLATION BELOW 75 DEGREES CENTIGRADE, SUSPENDING THE RESULTANT RESIDUE IN A LOW BOILING SATURATED ALIPHATIC HYDROCARBON, SEPARATING THE ISOLUBLE MATERIAL, REMOVING THE HYDROCARBON BY DISTILLATION AND RECONSTITUTING THE PYRETHRUM EXTRACT BY DISSOLVING THE FINAL RESIDUE OF PYRETHRIN ACTIVES IN AN ORGANIC SOLVENT.
Claim 2
Dependent Claim
75 words
THE PROCESS FOR PURIFYING CRUDE PYRETHRUM EXTRACTS WHICH COMPRISES MIXING A CRUDE EXTRACTS CONTAINING PYRETHRINS WITH ABOUT 95 PERCENT AQUEOUS METHYL ALCOHOL SEPARATING THE ALCOHOL LAYER, REMOVING THEREFROM METHYL ALCOHOL AND WATER BY DISTILLATION BELOW 75 DEGREES CENTIGRADE, SUSPENDING THE RESULTANT RESIDUE IN A LOW BOILING SATURATED ALIPHATIC HYDROCARBON, SEPARATING THE ISOLUBLE MATERIAL, REMOVING THE HYDROCARBON BY DISTILLATION AND RECONSTITUTING THE PYRETHRUM EXTRACT BY DISSOLVING THE FINAL RESIDUE OF PYRETHRIN ACTIVES IN AN ORGANIC SOLVENT.
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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |