Composite beam having a hollow cross section
CA 2074246 C · Owner: Adachi, Yutaka · Inventors: Adachi, Yutaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite beam having high compressive and tensile strength is disclosed. The beam is also very lightweight, has a high modulus of elasticity and is, able to support heavy loads in applications such as in use in aerial lift devices. High dielectric resistance is also a very important property exhibited by the beam. There are three structural layers in the beam including an inner layer comprising a wound filament a, middle layer comprising a plurality of plates and an, outer layer also comprising a woven or a non-woven material.
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 20, 1992 and granted November 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 20, 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.