Formwork component for concrete construction
CA 1091953 A · Owner: Kung, Herbert · Inventors: Kung, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a formwork component for use in concrete construction for the formation of a recess in a wall or ceiling, the component comprising a hollow body defining a central axis, the body having a resilient wall and at least one spreader mechanism adapted to adjust the shape of the hollow body to vary its crosssectional dimensions. In a first aspect the resilient wall includes at least one section bendable about an axis substantially co-planar with the central axis. The spreader mechanism may include at least one movable spreader component adapted to act on the resilient wall as a hinged lever.
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 December 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 23, 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.