Expired Canadian patentCanada
Built-up i-beam with laminated flange
CA 2199903 C · Owner: Irving, David C. · Inventors: Irving, David C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An I-beam for use in construction, built-up from a web held between a pair of laminated flanges. Each flange includes a first laminate made of oriented strand lumber and a second laminate laminated to the first laminate. The web is between the first laminates.
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 March 13, 1997 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 13, 1997
GrantedFebruary 22, 2000
Term endedMarch 13, 2017
Patent numberCA 2199903 C
Classification (IPC)E04C3/14
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.