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:
Dec. 12, 1989
Filed:
Jul. 10, 1987
Mary B Heffernan, Encinitas, CA (US);
Kenneth A Norton, Corvallis, OR (US);
Bruce Cowger, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The cleanliness in foams used as ink reservoirs and ink delivery systems in ink-jet printing is determined by at least one of two methods. In the first method, the amount of non-volatile residues is measured. An amount of NVRs of less than about 0.2 wt/wt % is sufficient to provide adequate ink fluid properties. In the second method, the surface tension is measured for ink vehicle prior to and following exposure to the foam. For inks formulated for specially-coated paper printing, so long as the surface tension following exposure to the foam is at least about 40 dyne/cm, then adequate ink fluid properties are assured. For inks formulated for plain paper printing, so long as the drop in surface tension is less than about 7 dyne/cm as compared to ink vehicle not so exposed, then adequate ink fluid properties are assured.