Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials
CA 2105142 C · Owner: Komatsu, Shigetomi · Inventors: Komatsu, Shigetomi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an apparatus for dissolving polystyrene waste materials the polystyrene waste materials are allowed to dissolve into a chlorinated solvent, providing a dissolving treatment apparatus for polystyrene waste materials which is low in collection and conveyance expenses, has a short treatment time has no public, nuisance problem such as the occurrence of black smoke and is, safe for humans. This apparatus is constituted to soak a polystyrene waste material 5 contained in a container 4 consisting of a water layer 2 at the upper portion and a solvent layer 3 of chlorinated hydrocarbons at the lower portion into the solvent layer 3 forcedly. The foamed polystyrene waste materials 5 can be …
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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 August 30, 1993 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 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.