Dry powder inhaler
CA 2398815 C · Owner: Ligotke, Michael · Inventors: Greenspan, Bernard; Ligotke, Michael; Ganem, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dry powder inhaler (20) has a dispersion chamber (30) containing beads (40). A dose of dry powder (142) is released into the chamber or into an inlet (26) , tangentially joining into the chamber. As the patient inhales on a nosepiece or mouthpiece (22), air moves circularly through the dispersion chamber to drive the beads. The beads roll, bounce and collide repeatedly with the drug , particles on the chamber surfaces or on the beads. The smaller active drug particles are separated from the larger carrier particles and from each other and a powder aerosol is created and inhaled by the patient. The beads are preferably lightweight, so that they can be rapidly accelerated and moved …
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 January 31, 2001 and granted April 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2023.
- 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.