Suspension ceiling grid runner with expansion means
CA 1252266 A · Owner: Donn Incorporated · Inventors: Shirey, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fire-rated type suspension ceiling grid runner is disclosed having expansion means intermediate its ends which collapse when the runner expands due to elevated temperature occurring during a fire or the like. The runner provides a boxlike panel supporting flange along the lower end of the web thereof in which slots are formed to define a flange segment and connecting legs. When the expansion means collapses the flange segment is, laterally displaced as a unit and remains connected to each adjacent portion of the boxlike flange by at least two longitudinally spaced legs. The displaced flange segment functions as a bridging beam which continues to connect the adjacent portions of the flange …
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 April 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 11, 2006.
- 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.