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:
Sep. 23, 2008
Filed:
Sep. 20, 2005
Juichi Furukawa, Atsugi, JP;
Hiroshi Adachi, Yokohama, JP;
Juichi Furukawa, Atsugi, JP;
Hiroshi Adachi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image is formed by applying a recording composition having a colorant and a treating composition including a component that reacts with colorant droplets so that the compositions contact and mix with each other on a recording medium; and adjusting the pH of the mixture so that the treating composition and the recording composition react to form aggregates while any unreacted component forms aggregates as a simple substance, wherein the component that reacts with the colorant has an isoelectric point at which the zeta potential (ζ) is 0 when zeta potential (ζ) change of the component is plotted versus corresponding changes in the pH of the mixture, and wherein the recording composition and treating composition are respectively adjusted to satisfy a<γ and a<c, wherein 'c' is a pH value of the isoelectric point, 'a' is a pH value of the mixture where the zeta potential (ζ) change according to pH is on the more acidic side than the pH (c) of the isoelectric point, and is about −2.5 mV·l/mol, and “γ” is the pH of the mixture.