Device for printing quality control
CA 1266710 C · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Falk, Per Ivar Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method and device for checking the printing quality of matrix or liquid jet printers, a character is printed in the paper margin and is optically sensed along a line shift. The signal pattern from the symbol is compared with a predetermined pattern corresponding to the correct reproduction of the character. An alarm signal is emitted if there is a difference between the signal patterns.
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
- Granted March 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2007.
- 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.