Wall vent
CA 2062907 C · Owner: Sirjoo, Malbee B. · Inventors: Sirjoo, Malbee B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air vent is installed in an outside wall and contains a screw thread on an inner surface of an inner end. An abutment is located inside the vent. A cap is shaped to screw into the vent and rests against the abutment when it is in a closed position. The cap and the abutment contain openings that permit air to flow through the vent when the cap is open and prevent air from flowing through the vent when the cap is closed. The cap can be partially open so that some air flows through the vent. The vent can be easily installed and maintained. It can be left open when the building is unoccupied, without any sacrifice in security.
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 12, 1992 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.