Structure smoke exhauster
CA 2084485 C · Owner: Chang, Hsing-Wen · Inventors: Chang, Hsing-Wen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A smoke exhauster structure comprises an enclosure having a releasably secured lower hood plate and a releasably secured fan housing disposed therein. The hood plate has a pair of spring loaded pivoting catches provided on respective rear corner portions thereof and a pair of protruding tabs on the front edge thereof which overlap and abut a retaining rim provided under the front panel of the enclosure. Each pivoting catch engages a respective locking bar in a rear portion of the enclosure to releasably secure the hood thereunder. The fan housing which surrounds the exhaust fans of the exhauster is releasably secured to the underside of a top plate of the enclosure by a set of latches …
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 December 3, 1992 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2014.
- 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.