I-beam for building structures
CA 2273139 A1 · Owner: Koller, Ernst · Inventors: Koller, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An I-beam with a main beam body and a head at each end. The heads are symmetrical widthwise laterally of the beam body with each head having an outwardly facing side shaped to define two identical longitudinally outwardly facing grooves. Each groove is shaped by longitudinally outwardly facing ribs and by transverse ribs at the free ends of the first mentioned ribs to define an opening into an undercut region inside the groove. The heights of the ribs are selected relative to the width of the grooves so that the height of the laterally outer rib of one beam fits into the height of the undercut of the groove of the other beam when the rib of one beam is installed in the groove of the other. …
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 May 27, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2021.
- 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.