Trench forming assemblies having enhanced anchoring means
CA 2131866 C · Owner: Abt, Inc. · Inventors: Stegall, Lannie L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trench forming assembly for forming a trench of predetermined shaped is disclosed according to the present invention. The assembly includes a pair of parallel elongate frame members for defining a support surface for supporting a trench cover. The assembly also includes an elongate form body for shaping a hardenable trench forming composition into the predetermined shape of the trench and having opposed side surfaces with which the frame members may be engaged. The trench forming assembly further includes at least one pair of upwardly extending legs for anchoring the frame members in a predetermined location. Each upwardly extending leg is joined at a top portion to one of the frame …
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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 September 12, 1994 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2016.
- 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.