Ws7622a mono- or di- sulfate, process for preparation thereof and use thereof
CA 2045761 C · Owner: Takase, Shigehiro · Inventors: Takase, Shigehiro; Okuhara, Masakuni; Ezaki, Masami
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are described WS7622A mono- or , di- sulfates and their pharmaceutically acceptable salts which have the following proposed formula: These compounds are useful for their human leukocyte elastase-inhibiting activity. The preparation of these compounds is carried by sulfating the WS7622A substance or a salt thereof.
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 June 26, 1991 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2013.
- 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.