Apparatus for forming voids in concrete and method of use thereof
CA 2033556 A1 · Owner: Cass, Ronald L. · Inventors: Cass, Ronald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for forming voids in concrete and the method of using the apparatus. The apparatus includes baseplates secured to a wood supporting deck or form for a concrete floor by a plurality of removable screws in a location determined by the plans of the concrete floor which usually requires the formation of various voids, cavities, openings or holes in the floor and a removable sleeve attached to each baseplate and having a height generally equal to the thickness of the floor with the upper end of the sleeve being accessible and observable when concrete is poured. In using the apparatus, the baseplates are affixed to the wood deck in accordance with the plans for the floor after the …
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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 January 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2013.
- 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.