Bar screen with rotating rakes
CA 2288934 C · Owner: Headworks Inc. · Inventors: Mahr, Gernot
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mechanically raked screen system is used for preliminary waste water treatment. A screen (2) is formed of a multiplicity of mutually parallel screen bars (14). The screen bars (14) are oriented substantially transversely relative to a flow direction of a flowing liquid and forming screen spaces of a given width therebetween. A rake assembly rakes the screenings from the screen (2). The rake assembly includes two endless chains (4) which are traveling about sprocket wheels (5) disposed laterally of the screen (2) and a rake (3) attached to and extending between the claims. The rake (3) is oriented substantially perpendicularly to the screen (2) and travels with the chains (4) for …
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 May 6, 1997 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2019.
- 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.