Manufacturing method of ink jet head
CA 2179869 C · Owner: Ohkuma, Norio · Inventors: Ohkuma, Norio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A manufacturing method for an ink jet head having an ink ejection pressure generation element for generating energy for ejecting ink and an ink supply port for supplying the ink to an ink jet head including the steps of preparing a silicon substrate; forming on a surface of the silicon substrate, the ink ejection pressure generation element and silicon oxide film or silicon nitride film; forming anti- etching mask for forming an ink supply port on a back side of the silicon substrate removing silicon on the back side of the silicon substrate at a position corresponding to the ink supply port portion through anisotropic etching; forming an ink ejection portion on a surface of the silicon …
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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 June 25, 1996 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2018.
- 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.