Vent
CA 1081528 A · Owner: Wasco Products, Inc. · Inventors: Jentoft, Arthur P.; Couture, Paul A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
VENT, Abstract of the Disclosure, A system for venting smoke and fumes from selected floors of a multi-story building comprising a vertical smoke pipe or shaft which extends from the basement to ehe roof of the building and a plurality of vent units disposed along the smoke shaft one being associated with each floor of the building. Each unit includes a hinge door that opens by gravity force and is normally maintained closed by a latch mechanism that may be operated remotely by electrical or pneumatic means or may be operated manually. A thin metallic gasket seals the door to its frame and further functions as a spring means for urging the door open when the latch mechanism is released. 1.
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
- Granted July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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.