Filtration membrane
CA 2069758 A1 · Owner: Shimodera, Kenichi · Inventors: Shimodera, Kenichi; Shimizu, Yasutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a filtration membrane which enables only a macromolecular component to be recovered with a high efficiency from a culture solution of a microorganism containing a particulate component and a macromolecular component. The filtration membrane according to the present invention is characterized by pores having an average pore diameter in the range from 10 nm to 10 µm or pores having a cut-off molecular weight in the range from 1 x 104 to 1 x 108, the membrane having a permeation resistance in the range from 5 x 1011 m-1 to 1 x 10l5 m-
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 September 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 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.