Improvement in a method of making a self-controlled heater and an improved self-controlled heater
CA 2100051 C · Owner: Moreno, Ricardo Proveda · Inventors: Moreno, Ricardo Proveda; Da Costa, Olavo Nunes; Kadooka, Humberto Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making a self-controlled heater comprises using a polymeric semiconductor based on lampblack cut into plate (2) with the intended configuration for the heater and then printing on it through silkscreening, of an electric conductive track (3) with silver ink. The heater includes a polymeric semiconductive substrate based on lampblack (1) having an electric conductive track printed with silver ink (3).
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 7, 1993 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2015.
- 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.