The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 2026
Filed:
Dec. 06, 2023
Canon Kabushiki Kaisha, Tokyo, JP;
Takeru Yasuda, Kanagawa, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An object is suppressing the reduction in the gas barrier property in a case where the cavitation resistance layer becomes thin. An embodiment of the present invention is a liquid ejection head substrate, including: a first layer that forms a heating element that generates heat energy to eject a liquid; a second layer that functions as an electric wiring connected with the heating element; a third layer that is insulative and covers the first layer and the second layer; and a fourth layer that is a layer arranged over the third layer so as to cover at least the heating element, formed of metal, and to generate an electrochemical reaction with the liquid, in which a first average crystal particle diameter on a side that is in contact with the liquid and a second average crystal particle diameter on a side of the third layer are different.