Two stage air filtration system
CA 2014404 C · Owner: Pneumafil Corporation · Inventors: Starling, Bobby L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two stage filtration system for removing textile waste materials and the like from transport air. The first stage includes a preseparator having a cylindrical screen and an inlet at the interior portion of the cylindrical screen and an outlet on the outside portion of the screen, and the outlet portion is in open communication with a panel filter for further cleaning. Large waste particles are separated by the cylindrical screen and contained in a compartment therebeneath. A second stage filter is provided which includes a generally rectangular housing having a flat filter element extending diagonally thereacross, a small fan is provided for diverting a relatively small portion of the …
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 April 11, 1990 and granted June 15, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2012.
- 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.