Porous cellulose ester articles having striated surfaces
CA 1278907 C · Owner: Browne, Colin L. · Inventors: Browne, Colin L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Skinless shaped articles having increased specific surface area and based on cellulose esters including both solid, and hollow fibers can be produced with at least one surface having a striated or fibrous appearance and a cellular interior structure by extruding a spinning solution comprising a cellulose ester and a solvent therefor directly into an aqueous bath wherein the residual content of solvent in the bath is maintained at a concentration below a critical level preferably less than, about 10 weight percent.
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
- Granted January 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 2008.
- 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.