US3055800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of pyrethrum extracts
Assignee: Cooper Mcdougall and Robertson Ltd
•
Filing: 1957-04-26
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Granted: 1962-09-25
•
Expires: 1977-04-26
Abstract
No abstract record available.
Inventors
- 👤 Edward S R Willmore
- 👤 Richard F Phipers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:17
CPC Classifications
A; A01; A01N; A01N53/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A PROCESS OF PURIFYING CRUDE PYRETHRUM 150-200*C. AT 0.1 MM. MERCURY PRESSURE WHICH COMPRISES CODISTILLING THE EXTRACT WITH A PYRETHRIN SYNERGIST SELECTED FROM THE GROUP CONSISTING OF PIPERONYL BUTOXIDE, BUTOXYETHOXYETHYL PIPERONYLATE AND THE 2-(2-ETHOXYETHOXY)ALKYL 3:4-METHYLENEDIOXY PHENYL ACETALS OF ACETALDEHYDE.
Claim 2
Dependent Claim
39 words
A PROCESS OF PURIFYING CRUDE PYRETHRUM 150-200*C. AT 0.1 MM. MERCURY PRESSURE WHICH COMPRISES CODISTILLING THE EXTRACT WITH A PYRETHRIN SYNERGIST SELECTED FROM THE GROUP CONSISTING OF PIPERONYL BUTOXIDE, BUTOXYETHOXYETHYL PIPERONYLATE AND THE 2-(2-ETHOXYETHOXY)ALKYL 3:4-METHYLENEDIOXY PHENYL ACETALS OF ACETALDEHYDE.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |