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. 12, 2007
Filed:
Oct. 24, 2002
Renato Conta, Ivrea, IT;
Anna Merialdo, Ivrea, IT;
Renato Conta, Ivrea, IT;
Anna Merialdo, Ivrea, IT;
Telecom Italia S.P.A., , IL;
Abstract
In an ink jet printhead, the ink feeding duct (), passing through the thickness of the silicon substrate, and in hydraulic communication with the ejection cells () through an outlet area () on the front surface () of the substrate (), is built in three successive stages of erosion of the substrate (), the first of which is performed on the rear surface () of the substrate, to produce a first cavity () having a depth (P), and a further cavity () communicating and having a depth (P), extending in the direction of the front surface (), and presenting a back wall () separated from the front surface () by a diaphragm (); the second stage is performed on the opposite front surface () to cut a channel () in the direction of the diaphragm (), of depth (P) and defining the contour of the outlet area () on the front surface (), and the third stage is performed from said rear surface () as a continuation of the erosion performed in the first stage, to remove the diaphragm () and open the duct () between the rear () and front () surfaces.