Filter medium for metal hot melt and treatment process for metal hot melt
CA 2117672 C · Owner: Nck Adrec Co. Ltd. · Inventors: Shirakawa, Hiroshi; Yamakawa, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a filter medium for a metal hot melt which medium is obtained by precipitating needle-shaped crystals on the surfaces of ceramic balls and a treatment process for a metal hot melt using the ceramic balls the surfaces of which have the needle-shaped crystals precipitated thereon and which comprises the step of bringing the metal hot melt into contact with the ceramic balls. The employment of the filter medium can lead to improvement in filter performance of the ceramic fillers.
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 September 8, 1994 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2016.
- 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.