Solid state shear extrusion pulverization
CA 2102257 C · Owner: Arastoopour, Hamid · Inventors: Shutov, Fyodor; Arastoopour, Hamid; Ivanov, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus for pulverization of natural and synthetic polymeric material by applying normal and shear forces sufficient to form fine powder by oppositely rotating generally conical meshing screws. The fine powder may be fluidized to prevent agglomeration and assist in its discharge. The process is suitable for thermoplastic and thermosetting polymers and foams. The process and apparatus are suitable for enhancement of reactivity of polymeric and solid monomeric material to form homopolymers, copolymers, and new polymeric materials.
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 November 2, 1993 and granted November 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2015.
- 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.