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:
Feb. 22, 1994
Filed:
Apr. 17, 1992
Applicant:
Inventors:
Roberto Morandotti, Mercenasco, IT;
Alessandro Scardovi, Ivrea, IT;
Assignee:
Ing. S. Olivetti & C., S.p.A., Ivrea, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
3461 / ; 7330 / ;
Abstract
The ink detecting device gives advance warning of the end of the ink in a reservoir or cartridge feeding an ink-jet thermal print head. The device comprises a pair of electrodes that are immersed in a spongy, ink-soaked body contained in the reservoir, and are arranged in a region adjacent to the feed duct at which the spongy body has a 30% to 100% higher capillarity than in remote regions. The electrodes are connected to a bridge circuit which measures the electrical resistance of the ink between the two electrodes.