Multipurpose composite tubing
CA 2203640 C · Owner: Cerntube Pty. Ltd. · Inventors: Clarkson, Michael; Villaescusa, Mariano; Adams, Kevin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel tube material, and method of forming the tube are described. The tube , has an inner liner (1) preferably flexible, an intermediate layer of in situ moulded expanding foam material (2), and a flexible outer line (3). The tube is rigid, with the structural strength derived entirely from the intermediate layer. The preferred method of construction uses an inner core (4) which is , used to hold the inner liner in place during forming. The inner core (4) includes a mechanism to reduce its diameter to facilitate removal after , curing of the foam.
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 October 25, 1995 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2017.
- 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.