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:
Apr. 22, 1997
Filed:
Dec. 06, 1994
Applicant:
Inventors:
Roberto Morandotti, Mercenasco, IT;
Alessandro Scardovi, Ivrea, IT;
Assignee:
Olivetti-Canon Industriale S.p.A., Ivrea, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ; B41J / ;
U.S. Cl.
CPC ...
347-7 ; 347 87 ; 347 93 ;
Abstract
In an ink-jet printing unit comprising a printing head mounted on the container, a measuring circuit comprising a pair of electrodes which substantially enclose the volume of ink within the container, allows hysteresis- free linear mode measurement of variations in the ink volume within the container and the signalling of at least one of the ends of the variation interval to indicate the most suitable moment for recharging ink in the container by means of a cartridge inserted into the container.