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:
Mar. 06, 1990
Filed:
Feb. 15, 1989
Applicant:
Inventor:
David J Langrick, Lubenham, GB;
Assignee:
Willett International Limited, Chalvey, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 55 ;
Abstract
A device for measuring the viscosity of a fluid is shown which can be used to continuously measure the viscosity of the ink used in an ink jet printer. The pressure between two restrictors which respond differently to a change in viscosity is related to the total pressure drop across both restrictors to provide an indication of the change in viscosity of the fluid being dispensed by the printer. By utilizing this information, the viscosity of the ink can be modified to maintain the viscosity within the desired range.