High strength structural members
CA 2069310 A1 · Owner: Johnson, Michael Ian · Inventors: Johnson, Michael Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A structural member (1) is thin walled and hollow. The walls (4 5, 6, 7) of the member (1) have a series of protrusions (2) or depressions (3) formed in the general plane of each wall (4 5), which act to strengthen the member (1). The depressions (3) in one wall (4, 5) abut the inner surface of an opposing wall (6 7) to, provide a resistance to crushing of the member (1). The position and alignment of the protusions (2) and depressions (3) can be altered to suit the intended use of the structural member (1). Structural members may be lintels I-beams or of other structural, shape and will have a lower mass when compared to members of the same strength.
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 July 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 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.