Construction block
CA 2030190 C · Owner: Doran, William Elmer · Inventors: Doran, William Elmer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A construction block to be used with other similar blocks in order to construct panels of a building which is formed of a pair of substantially planar panels located in juxtaposition and spaced apart forming a space between the panel. Within the space between the panel, there is to be poured a quantity of uncured wet aggregate and cement mixture which is then to harden into a solid mass. Each of the panels is to be constructed of expanded polystyrene beads. The panels are secured together through a metallic tie rod assembly which is located principally in the space between the panels. The exterior surface of each of the panels includes a plurality of vertical grooves and within each groove …
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 November 16, 1990 and granted February 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2012.
- 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.