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Details for Patent: 3,985,758

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Summary for Patent: 3,985,758

Title: 1,4-Dihydropyridine derivatives
Abstract:There are provided novel 1,4-dihydropyridine derivatives, particularly 2,6-dimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-.beta.-(N-benzyl-N-methylamino)ethyl ester and 5-methyl ester. The 1,4-dihydropyridine derivatives are characterized by cerebral vascular dilator activity.
Inventor(s): Murakami; Masuo (Tokyo, JA), Takahashi; Kozo (Tokyo, JA), Iwanami; Masaru (Yokohama, JA), Fujimoto; Masaharu (Tokyo, JA), Shibanuma; Tadao (Asaka, JA), Kawai; Ryutaro (Shiraoka, JA), Takenaka; Toichi (Tokyo, JA)
Assignee: Yamanouchi Pharmaceutical Co., Ltd. (Tokyo, JA)
Application Number:05/584,268
Patent Claim Types:
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Compound;

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Foreign Priority and PCT Information for Patent: 3,985,758

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
48-25566Mar 3, 1973
48-52307May 11, 1973
48-83276Jul 24, 1973

International Patent Family for Patent: 3,985,758

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria334898► subscribe
Austria334902► subscribe
AustriaA138874► subscribe
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The estimated expiration dates shown above are derived by simply adding 20 years to the priority date.
Due to the complexity of determining patent expirations even in a single country, compounded by the diversity of global patent laws, it is advisable to have patent counsel verify freedom to operate.

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