Densification of polypyrrolidone
CA 1109627 A · Owner: Chevron Research And Technology Company · Inventors: Katsumoto, Kiyoshi; Nimer, Edward L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for reducing the water content and improving the bulk density of powdered polypyrrolidone having an initial water content of about 5-60 wt percent which comprises compressing said powdered polypyrrolidone at temperatures of 50°C or higher and a pressure of 50 to 300 psi to produce solid polypyrrolidone, such as kibble, having a dry bulk density of about 20-50 pounds per cubic foot. The product is especially useful as feed for the melt extrusion of polypyrrolidone filaments.
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 September 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1998.
- 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.