Control of energy to thermal inkjet heating elements
CA 2048277 C · Owner: Hewlett-Packard Company · Inventors: Keefe, Brian J.; Bohorquez, Jaime H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermal ink jet printhead including a substrate a, resistor layer on the substrate having ink drop firing resistors and energy controlling resistors defined therein a metallization layer adjacent the resistor layer and having metallic interconnections formed therein for providing serial energy controlling connections between predetermined ones of the ink drop firing resistors and predetermined ones of the energy controlling resistors a plurality, of ink containing chambers respectively formed over the metallization layer adjacent respective ones of the ink drop firing resistors, and an orifice plate secured over the chambers and containing a plurality of nozzles respectively associated …
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 August 1, 1991 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 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.