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. 12, 2005
Filed:
Mar. 19, 2002
John B. Vincent, Midland, MI (US);
Susan J. Babinec, Midland, MI (US);
Daniel L. Dermody, Midland, MI (US);
Yu Chen, Midland, MI (US);
John B. Vincent, Midland, MI (US);
Susan J. Babinec, Midland, MI (US);
Daniel L. Dermody, Midland, MI (US);
Yu Chen, Midland, MI (US);
Aveso, Inc., Frankenmuth, MI (US);
Abstract
The present invention relates to a composition and to a display device having the composition positioned between electrodes. The composition contains: (a) a compound that undergoes a reversible redox reaction to generate a pH gradient between the two electrodes, (b) an indicator dye, (c) a charge transport material, and optionally, (d) a matrix material and (e) an opacifier, and (f) secondary redox couple wherein components (a), (b), and (c) are different from one another and the standard reduction potential of component (a) is less than the standard reduction potential for the other components. Depending on the electric field present between the electrodes, a display image may be generated.