Patent US3971782A successfully refreshed from Google Patents.
US3971782A
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Fluorene derivatives
Assignee: John Wyeth and Brother Ltd
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Filing: 1975-11-04
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Granted: 1976-07-27
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Expires: 1995-11-04
Abstract
Abstract The invention relates to fluorene derivatives of the formula AND THEIR PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALTS. In the formula R1, R2, R3 and R4 each represent hydrogen, hydroxyl, lower alkyl, lower alkoxy or halogen, R5 and R6 each represent hydrogen or lower alkyl and n represents 1 or 2. The compounds have hypoglycaemic activity.
Inventors
- 👤 Alan Chapman White
- 👤 Robin Michael Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:47
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D233/00; C07D233/04; C07D233/06; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A compound selected from the group consisting of a fluorene derivative of formula ##SPC9##and a pharmaceutically acceptable acid addition salt thereof, wherein R 1 , R 2 , R 3 and R 4 each represents a member from the group consisting of hydrogen, hydroxyl, lower alkyl, lower alkoxy and halogen, R 5 and R 6 each represents a member from the group consisting of hydrogen and lower alkyl and n represents 1 or 2.
Claim 2
Dependent Claim
74 words
A compound selected from the group consisting of a fluorene derivative of formula ##SPC9##and a pharmaceutically acceptable acid addition salt thereof, wherein R 1 , R 2 , R 3 and R 4 each represents a member from the group consisting of hydrogen, hydroxyl, lower alkyl, lower alkoxy and halogen, R 5 and R 6 each represents a member from the group consisting of hydrogen and lower alkyl and n represents 1 or 2.
Claim 3
Dependent Claim
54 words
A compound as claimed in claim 1 of which is a fluorene derivative of formula ##SPC10##or a pharmaceutically acceptable acid addition salt thereof wherein R 1 is selected from the group consisting of hydrogen, hydroxyl, lower alkyl, lower alkoxy and halogen and R 3 is selected from the group consisting of hydrogen and halogen.
Claim 4
Dependent Claim
9 words
A compound as claimed in claim 1 which 9-(1,4,5,6-tetrahydro-2-pyrimidinyl)-9H-fluoren-9-ol.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |