Rotary filtration device and filter pack therefor
CA 2106989 C · Owner: Rolchigo, Philip M. · Inventors: Rolchigo, Philip M.; Kahn, Malcolm R.; Hodgins, Leonard T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary filtration device (20) comprises housing (22) and two entry means (doors) (24 and 26) that are hingedly attached by hinges (38). Door (24) is rotated closed and then locked shut after the filter packs (not shown) have been inserted into their normal operating positions in the device. Locking is accomplished by means of the cooperation of notches (40) and locking means (42). Door (26) is shown in the closed and locked position. Rotation means (motor) (28) is connected to rotatable shaft (30) (not shown), which shaft is within outer housing (36). Rotating circular members (discs) (32), which have spiral grooves (34) are fixedly attached, to the shaft for rotation. During normal …
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 28, 1992 and granted June 3, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2014.
- 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.