Patent US3247207A successfully refreshed from Google Patents.
US3247207A
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New methods of preparation of compounds of the vinyl-anthraquinone group and intermediates for such preparations
Assignee: Air Liquide SA
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Filing: 1963-05-31
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Granted: 1966-04-19
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Etienne Andre
- 👤 Arditti Georges
- 👤 Chmelevsky Alexandre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:57
CPC Classifications
C; C07; C07C; C07C50/00; C07C50/38; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; C07C46/00; C07C50/16; C07C50/20; C07C50/24; C07C50/26; C07C50/32; C07C50/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD FOR PREPARING 2-VINYL-ANTHRAQUIONE COMPRISES DEHYDROGENATING 2-ETHYL-ANTHRAQUINONE VAPOUR AT HIGH TEMPERATURE, SAID VAPOUR BEING MIXED WITH AN INERT GAS SELECTED FROM THE GROUP CONSISTING OF NITROGEN AND CARBON DIOXIDE, THROUGH CONTACT WITH A HYDROGENATION CATALYST. 3. 1-(2''-ANTHRAQUINONYL) ETHYL PYRIDINIUM CHLORIDE OF THE FORMULA
Claim 2
Independent Claim
44 words
A METHOD FOR PREPARING 2-VINYL-ANTHRAQUIONE COMPRISES DEHYDROGENATING 2-ETHYL-ANTHRAQUINONE VAPOUR AT HIGH TEMPERATURE, SAID VAPOUR BEING MIXED WITH AN INERT GAS SELECTED FROM THE GROUP CONSISTING OF NITROGEN AND CARBON DIOXIDE, THROUGH CONTACT WITH A HYDROGENATION CATALYST. 3. 1-(2''-ANTHRAQUINONYL) ETHYL PYRIDINIUM CHLORIDE OF THE FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |