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:
May. 27, 2025
Filed:
Jul. 25, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Souta Takeuchi, Kanagawa, JP;
Masaya Uyama, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A highly reliable liquid ejection head comprises a substrate made of silicon and having a first surface and a second surface opposite to the first surface, an ejection port forming member bonded to the first surface of the substrate and formed with an ejection port for ejecting liquid, and a bonded member configured to be bonded to the second surface of the substrate. A through flow path is formed in the substrate, which is configured to pass through the substrate and to supply liquid to the ejection port. A first protective film made of a metal oxide is formed on an inner surface of the through flow path, and a second protective film made of a silicon compound is formed on all of the second surface of the substrate.