Respiratory filter
CA 2057862 C · Owner: Hicks, Richard Banfield · Inventors: Hicks, Richard Banfield
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter for inclusion in a respiratory system used in anaesthesia and patient ventilation, comprises a two-part housing (1S) and (16) having coaxial ports (13) and (14) for connection to breathing tubes. Optionally a heat/moisture exchanger (25) spans the housing in addition to a planar filter member (24) which is held between parts (15) and (16) so as to be perpendicular to the direction of gas flow through the housing. According to the invention deflectors (30) and (19) are located , relative to the ports (13) and (14) so as to spread incoming gases over the opposed surfaces of members (24) and (25) in order to utilise their total surface areas, thereby reducing the overall size 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 May 21, 1990 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.