Process for producing a carrier for immunoassay
CA 2038059 C · Owner: Hagi, Norio · Inventors: Takeyama, Takahiro; Hagi, Norio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing carriers for immunoassay which comprises;, 1 a step of cutting a polystyrene material into pellets, 2 a step of polymerizing the polystyrene pellets and a monomer required for forming polystyrene in the presence of a polymerization initiator and a crosslinking agent in a medium in which the pellets and the monomer are hardly soluble, to obtain spherical polystyrene beads, and, 3 a step of roughening the surface of the spherical polystyrene beads.
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 March 12, 1991 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.