Expired Canadian patentCanada
Ventilation tube, particularly for medical devices
CA 2257838 C · Owner: Tyco Healthcare Group Lp · Inventors: Bergamaschi, Paolo; Gibertoni, Lucio
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heated ventilation tube (1) having at least one heating wire (4 5) embedded , in a helical ridge (3) along the outer wall (2).
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 June 10, 1997 and granted May 6, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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.
FiledJune 10, 1997
GrantedMay 6, 2003
Term endedJune 10, 2017
Patent numberCA 2257838 C
Classification (IPC)A61M16/00 +2 more
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.