Seal-less pump
CA 1238520 A · Owner: World Chemical Co. Ltd. · Inventors: Mori, Youji; Satou, Kenichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-stage metallic pump or chemical pump with plural impellers arranged in series. The impeller of the first-stage is integrally provided with radial flow ribs on the under surface of the impeller and with backside radial ribs on the upper surface of the impeller which are larger, than the front radial flow ribs as regards the diameter of the circle formed by the respective tips of the ribs. A flange is formed as an extension beyond the circumference of the first-stage impeller and is integrally provided with a protruding ring on the upper surface of the flange. The protruding ring rotates in a fixed recess formed in a casing, with a certain gap kept. Because of the rotation the liquid …
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 June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2005.
- 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.