Void form
CA 2030080 A1 · Owner: Mccarthy, Grant · Inventors: Mccarthy, Grant
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A unique void form for use under grade beams in construction sites is disclosed. The void form has downwardly extending projections which run across the width of the void form at 90° to the longitudinal axis. The projections support the void form on the subsoil and provide additional space for the subsoil to heave as a result of frost or other temperature changes. The top of the void form has a flat surface and is adapted to support a poured concrete grade beam. The form is left in the ground after construction is complete.
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 15, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 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.