Improvements in or relating to electrical insulators
CA 2095229 C · Owner: Lambeth, Peter John · Inventors: Lambeth, Peter John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a barrier (1) for an insulator having a central portion or stem with a plurality of sheds extending therefrom. The barrier (I) is, in use located between adjacent sheds of the insulator and comprises a sheet (2) of dielectric material having one or more discontinuities in its surface. The discontinuities can be in the form of holes (3 24) in the surface or, in the form of a joint between cut edges (2) of the barrier (1).
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 November 6, 1991 and granted May 13, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2013.
- 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.