High shear pipeline tape
CA 2243741 C · Owner: Barnes, Scott C. · Inventors: Barnes, Scott C.; Blanchini, Rosana; Huddleston, Elwyn G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high shear adhesive tape having an adhesive layer containing a rubber mix and at least one tackifier agent, the rubber mix including an effective amount of a, crosslinked halogenated butyl rubber the remaining rubber in the mix being non-crosslinked, the non-crosslinked rubber preferably being butyl rubber the adhesive layer , further being, characterized as being free of any crosslinking agent for the remaining rubber in the mix; and, pipewrap systems employing this tape.
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, 1998 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 20, 2020.
- 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.