Ventilator
CA 2100494 C · Owner: Kratochvil, Joseph M. · Inventors: Kratochvil, Joseph M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ventilator for clothes dryers and the like includes a counterflow heat exchanger through the wall of the building containing the apparatus with an entry, passage for ambient air entering the building and an exist passage for heated waste air leaving the building. An external housing defines an outlet chamber communicating with the exit passage, and an inlet chamber communicating with theentry passage. The chambers are both open to the ambience and the two openings, are adjacent one another with a damper mounted for pivotal movement between a closed position in which the damper closes both of the openings and an open position, in which it opens both of the openings. The damper is biased …
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 July 14, 1993 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2015.
- 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.