Andrew J Mcclaren

US Patent:

20050141910, Jun 30, 2005

Filed:

Dec 31, 2003

Appl. No.:

10/749868

Inventors:

Hsin Chou - Woodbury MN, US
William Edwards - New Richmond WI, US
Robert Brenner - New Richmond WI, US
Andrew McClaren - Blaine MN, US

International Classification:

G03G015/10

US Classification:

399057000

Abstract:

A method measures the conductivity (σ) of a liquid or paste electrophotographic toner by providing two parallel plane conductive plates with a uniform separation (d) between the plates to form a space between the plates; filling the space between the plates with liquid or paste electrophotographic toner; applying an alternating current voltage of at least 100V between the plates across the liquid or paste toner; measuring as data the current passing through an external component into the plates; adjusting the data to remove current contributions attributable to impurity ions; sending adjusted data to a processor; and determining the conductivity from the adjusted data.