Patent US3849453A successfully refreshed from Google Patents.
US3849453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinone derivatives
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1971-03-15
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Granted: 1974-11-19
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Expires: 1991-03-15
Abstract
Abstract 1. A MEMBER SELECTED FROM THE GROUP CONSISTING OF A COMPOUND OF THE FORMULA 1,4-DI(O=),2-(H3C-),3-(R-OOC-CH(-A'')-CH(-A)-CH2-)-1,4- DIHYDRONAPHTHALENE WHEREIN ONE OF A AND A'' IS HYDROGEN AND THE OTHER IS LOWER ALKYL, AND R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL OF 1-6 CARBON ATOMS, CYCLOALKYL OF UP TO 6 CARBON ATOMS AND ALLYL, AND PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF.
Inventors
- 👤 H Morimoto
- 👤 M Nishikawa
- 👤 M Watanabe
- 👤 I Imada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:57
CPC Classifications
C; C07; C07C; C07C66/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
13 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF A COMPOUND OF THE FORMULA
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |