Adjustable concrete formwork system
CA 2123791 A1 · Owner: Channel Form Systems Inc. · Inventors: Sandwith, Stanley R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention pertains to a novel adjustable formwork system which can be used in the manufacture of a wide range of structurally efficient cross-sectional shaped concrete beams columns and, structures. A cast-in-place concrete beam form comprising: (a) at least two spatially oriented upper sleeves (70) with an upper web , located on one side of the two sleeves and extending, therebetween; (b) at least two spatially oriented lower sleeves (72) with a, lower web located on one side of the two sleeves and extending , therebetween; and (c) at least two members (98) each member, connecting telescopically the respective upper sleeve with the respective lower sleeve, said telescoping members …
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 September 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2014.
- 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.