US2607796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline isomer of allethrin
Assignee: Individual
•
Filing: 1951-08-03
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Granted: 1952-08-19
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Expires: 1971-08-03
Abstract
No abstract record available.
Inventors
- 👤 Milton S Schechter
- 👤 Forge Frederick B La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:10
CPC Classifications
A; A01; A01N; A01N53/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS COMPRISING COOLING THE BELOW ABOUT 10* C. THE ESTERS OF DI-2ALLYL-4-HYDROXY-3METHYL-2-CYCLOPENTEN-1ONE WITH DL-CHRYSANTHEMUM MONOCARBOXYLIC AID, THE DL-CHRYSANTHEMUM ACID BEING AT LEAST IN PART THE TRANS ACID, TO CRYSTALLIZE THE ALPHA-DL-TRANS-ISOMER, NAMELY, THE DL-TRANS-CHRYSANTHEMUM MONOCARBOXYLIC ACID ESTER OF SAID HYDROXYCYCLOPENTENONE, HAVING A MELTING POINT WHEN PURIFIED OF ABOUT 50-51* C., AND SEPARATING THE CRYSTALS.
Claim 2
Dependent Claim
55 words
A PROCESS COMPRISING COOLING THE BELOW ABOUT 10* C. THE ESTERS OF DI-2ALLYL-4-HYDROXY-3METHYL-2-CYCLOPENTEN-1ONE WITH DL-CHRYSANTHEMUM MONOCARBOXYLIC AID, THE DL-CHRYSANTHEMUM ACID BEING AT LEAST IN PART THE TRANS ACID, TO CRYSTALLIZE THE ALPHA-DL-TRANS-ISOMER, NAMELY, THE DL-TRANS-CHRYSANTHEMUM MONOCARBOXYLIC ACID ESTER OF SAID HYDROXYCYCLOPENTENONE, HAVING A MELTING POINT WHEN PURIFIED OF ABOUT 50-51* C., AND SEPARATING THE CRYSTALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |