Method of making an electrical device comprising a conductive polymer
CA 2048648 C · Owner: Feldman, Randall M. · Inventors: Dharia, Amitkumar N.; Batliwalla, Neville S.; Mehan, Ashok K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical device (1), particularly a self-regulating strip heater has improved thermal efficiency, good mechanical properties, and acceptable resistance to water penetration when an outer insulating layer (7) is applied in a way that it penetrates the interstices of a braid (6) surrounding the heater. Appropriate may be achieved by pressure-extruding the outer jacket (7) over the braid (6).
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 13, 1990 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2012.
- 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.