Patent US3666798A successfully refreshed from Google Patents.
US3666798A
Expired / Lapsed
US
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Production of optically active chrysanthemic acid
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1970-08-10
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Granted: 1972-05-30
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Expires: 1990-08-10
Abstract
Abstract An optical resolution method for preparation of optically active chrysanthemic acid which comprises reacting ( + OR - )chrysanthemic acid with L-lysine to form (+)-chrysanthemic acid L-lysine salt and decomposing the salt with a dilute acid.
Inventors
- 👤 Masanao Matsui
- 👤 Fukashi Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:07
CPC Classifications
A; A01; A01N; A01N53/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
A process according to claim 1 wherein the solvent is methanol.
Claim 2
Dependent Claim
11 words
A process according to claim 1 wherein the solvent is ethanol.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein the solvent is dimethyl sulfoxide.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the solvent is a mixture of water and methanol, ethanol, or dimethyl sulfoxide.
Claim 5
Dependent Claim
16 words
A process according to claim 1, wherein the chrysanthemic acid is trans-chrysanthemic acid and/or cis-chrysanthemic acid.
Claim 6
Dependent Claim
16 words
A process according to claim 1, wherein the heating is effected at 40* to 120* C.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the cooling is effected at 30* to -30* C.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |