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Details for Patent: 4,572,912

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Summary for Patent: 4,572,912

Title: Thiazolidine derivatives, their preparation and compositions containing them
Abstract:The compounds of formula (I): ##STR1## [in which: R.sup.1 and R.sup.2 are the same or different and each represents hydrogen or C.sub.1 -C.sub.5 alkyl; R.sup.3 represents hydrogen, an acyl group, a (C.sub.1 -C.sub.6 alkoxy)carbonyl group or an aralkyloxycarbonyl group; R.sup.4 and R.sup.5 are the same or different and each represents hydrogen, C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkoxy, or R.sup.4 and R.sup.5 together represent a C.sub.1 14 C.sub.4 alkylenedioxy group; n is 1, 2 or 3; W represents the --CH.sub.2 --, >CO or >CH--OR.sup.6 group (in which R.sup.6 represents any one of the atoms or groups defined for R.sup.3 and may be the same as or different from R.sup.3); and Y and Z are the same or different and each represents oxygen or imino] and pharmaceutically acceptable salts thereof have various valuable therapeutic effects on the blood system and may be prepared by a process which includes reacting a corresponding halopropionic acid derivative with thiourea.
Inventor(s): Yoshioka; Takao (Hiromachi, JP), Kitazawa; Eiici (Hiromachi, JP), Kurumada; Tomoyuki (Hiromachi, JP), Yamazaki; Mitsuo (Hiromachi, JP), Hasegawa; Kazou (Hiromachi, JP)
Assignee: Sankyo Company Limited (Tokyo, JP)
Application Number:06/644,996
Patent Claim Types:
see list of patent claims
Compound; Use; Composition;

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Foreign Priority and PCT Information for Patent: 4,572,912

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan58-158375Aug 30, 1983

International Patent Family for Patent: 4,572,912

Country Document Number Estimated Expiration Supplementary Protection Certificate SPC Country SPC Expiration
Austria33838► subscribe
Australia3255984► subscribe
Australia570067► 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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