Shoring device
CA 1296908 C · Owner: Southland Industries, Inc. · Inventors: Bradberry, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, There is disclosed a device for shoring the side walls of a trench or the like which includes a pair of elongate rails and a pair of parallel, hydraulically extendible and contractible actuators connected at opposite ends to the rails for lowering with the rails into and out of positions between the walls of the trench, and adapted when extended, to hold the rails tightly against the walls.
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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
- 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.