System for preventing abnormal heating of thermal head
CA 2063984 C · Owner: Ameno, Keiji · Inventors: Nakano, Akira; Ameno, Keiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for preventing abnormal heating of a thermal head, which is configured with pure hardware. In the system when a temperature of the thermal head becomes an abnormally high temperature exceeding a predetermined temperature and/or an active time of a print-time setting signal cyclically issued from a microcomputer for activating the thermal head only for a time period necessary for printing of one line of picture image becomes abnormally long, a flip-flop is set so that three sorts of switch circuits are respectively operated in such a manner as follows, whereby the abnormal heating of the thermal head can be prevented at a very high reliability. (1) The supply of a drive voltage to …
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 25, 1992 and granted September 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2014.
- 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.