Condensed thiophene compounds and pharmaceutical use thereof
CA 2302409 A1 · Owner: Tanaka, Hiroshi · Inventors: Seio, Koji; Kimura, Koreichi; Fujimura, Masatake
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fused thiophene compounds represented by general formula (I) pharmaceutically , acceptable salts thereof or hydrates of the same wherein each symbol is as , defined in the description. The compounds of general formula (I) are useful as novel antipsychotics which are efficacious against both of positive and negative symptoms of schizophrenia, exhibit little side effects such as extrapyramidal motility disturbance, and have little severe side effects such as granulocytopenia. These compounds are also useful as remedies for dementia of Alzheimer type and periodic psychosis.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 31, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.