Plastic plug member for concrete form tie rods
CA 2034584 C · Owner: Distribution Rock Desilets Inc. · Inventors: Desilets, Rock
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A one piece plug member can be mounted on a cross sectional irregularity of a generally rectangular concrete form tie rod in order to produce an outer cavity in a mass of concrete poured in the form. The plug member comprises a body made of plastic material, defining a frusto-conical outer surface, and formed with an axial and cylindrical hole defining a constriction. The constriction is constituted by an annular wall formed in the hole at the end of larger diameter of the body. A method is also provided to mount the plug member on the tie rod. In accordance with this method the plastic body is, heated to increase its malleability and allow it to deform, and the tie rod is slid into the …
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 January 18, 1991 and granted January 12, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 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.