Process for preparing shaped article having thick section
CA 1312697 C · Owner: Ishimaru, Yoshiharu · Inventors: Yamato, Motoyuki; Chono, Koji; Ishimaru, Yoshiharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A substantially pore-free shaped article having a thick section, composed of polycyclic norbornene polymer, is produced by bulk-polymerizing a norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold while controlling the maximum curing exotherm temperature of the reaction mixture to a level not exceeding 160°C; this process permits manufacture of large machinable plastic stock of superior physical characteristics such as reduced water-absorbing property by reactive injection molding.
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 12, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 12, 2010.
- 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.