Filter machine
CA 1234357 A · Owner: Johnson, Willard L. · Inventors: Johnson, Willard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a suction-type filter machine a plurality of, filter leaves each having a core panel of egg-crate type walls defining transverse passageways through said panel and openings through said walls to provide vertical horizontal, and longitudinal passageways for filtrate flow drawn by a suction pump through the filter medium enwrapping the core panel and a conduit conductor enclosing an edge portion of the core panel.
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 March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 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.