Patent US3282985A successfully refreshed from Google Patents.
US3282985A
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Method for producing dextro-trans-pyrethric acid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1963-12-17
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Granted: 1966-11-01
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Expires: 1983-12-17
Abstract
No abstract record available.
Inventors
- 👤 Matsui Masanao
- 👤 Meguro Hiroshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:58
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/41; C07C51/412; C07C55/00; C07C55/02; C07C55/10; C07C55/14; C07C67/00; C07C67/08; C07B; C07B2200/00; C07B2200/07; C07C2601/00; C07C2601/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A METHOD FOR PRODUCING DEXTRO-TRANS-PYRETHRIC ACID, WHICH COMPRISES HALF-SAPONIFYING DIMETHYL DEXTRO-TRANSCHRYSANTHEMUM DICRABOXYLATE WITH THE APPROXIMATELY EQUIMOLAR AMOUNT OF A MEMBER OF ALKALI METAL HYDROXIDE AND LOWER-ALCOHOLATE, TREATING THE MIXTURE OF THE MONOMETHYL ESTERS WITH THE APPROXIMATELY EQUIMOLAR AMOUNT OF QUININE TO FORM A MIXTURE OF THE SALTS THEREOF, SUBJECTING THE MIXTURE OF THE SALTS OF A FRACTIONAL CRYSTALLIZATION WITH AN ORGANIC SOLVENT TO SEPARATE THE QUININE SALT OF DEXTRO-TRANS-PYRETHRIC ACID FROM THAT OF DEXTRO-TRANS-B(2,2-DIMETHYL-3-METHOXY - CARBONYL - CYCLOPROPYL)METHACRYLIC ACID, AND HYDROLYZING THE SEPARATED SALT TO YIELD FREE DEXTRO-TRANS-PYRETHRIC ACID.
Claim 2
Independent Claim
89 words
A METHOD FOR PRODUCING DEXTRO-TRANS-PYRETHRIC ACID, WHICH COMPRISES HALF-SAPONIFYING DIMETHYL DEXTRO-TRANSCHRYSANTHEMUM DICRABOXYLATE WITH THE APPROXIMATELY EQUIMOLAR AMOUNT OF A MEMBER OF ALKALI METAL HYDROXIDE AND LOWER-ALCOHOLATE, TREATING THE MIXTURE OF THE MONOMETHYL ESTERS WITH THE APPROXIMATELY EQUIMOLAR AMOUNT OF QUININE TO FORM A MIXTURE OF THE SALTS THEREOF, SUBJECTING THE MIXTURE OF THE SALTS OF A FRACTIONAL CRYSTALLIZATION WITH AN ORGANIC SOLVENT TO SEPARATE THE QUININE SALT OF DEXTRO-TRANS-PYRETHRIC ACID FROM THAT OF DEXTRO-TRANS-B(2,2-DIMETHYL-3-METHOXY - CARBONYL - CYCLOPROPYL)METHACRYLIC ACID, AND HYDROLYZING THE SEPARATED SALT TO YIELD FREE DEXTRO-TRANS-PYRETHRIC ACID.
References Cited (Backward Citations)
US3009946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |