Method to construct the prestressed composite beam structure and the prestressed composite beam for a continuous beam thereof
CA 2134644 C · Owner: Dae Nung Industrial Co. Ltd. · Inventors: Koo, Min Se; Koo, Min Se
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A prestressed composite beam structure from which the expansion joints, which were inevitably used in the conventional prestressed composite beam structure can be removed so that the structural and functional problems owing to the expansion joints can be solved and the span of beans can be lengthened and, construction materials can be considerably saved. The construction method in which the composite beams can be Dade into divided short beams in order to overcome the difficulties of transportation and handling in cases where the length of the prestressed composite beam is long. After the preflexion loads have been applied to the beam which was profiled in reverse to the sag curve of the …
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 23, 1994 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 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.