Ventilation grille
CA 2011786 C · Owner: Muller, Gottfried · Inventors: Hipp, Paul; Muller, Gottfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a ventilation grille comprising a housing having a rear wall provided with apertures and side walls projecting from the rear wall defining a compartment having an opening wherein fins are pivotably mounted on the side walls for controlling the flow of air through the opening. A damper is located in the compartment defined by the side walls and rear walls between the fins and the rear wall for controlling the passage of air therebetween. The housing is formed in one piece. This ventilation grille is easier and cheaper to manufacture. The process of manufacture is also disclosed. According to the process the slots of the rear wall are stamped from one strip of …
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 March 8, 1990 and granted January 4, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 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.