Richard A Burt, Cheng Kuo Hsiao, Dasarao Murti, Roger E Gaynor, Barkev Keoshkerian, James D Mayo, George Liebermann: Processes for the preparation of hydroxygallium phthalocyanine. Xerox Corporation, E O Palazzo, May 28, 1996: US05521306 (126 worldwide citation)

A process for the preparation of Type V hydroxygallium phthalocyanine which comprises the in situ formation of an alkoxy-bridged gallium phthalocyanine dimer, hydrolyzing said alkoxy-bridged gallium phthalocyanine dimer to hydroxygallium phthalocyanine, and subsequently converting the hydroxygallium ...






Maria M Birau, Rina Carlini, C Geoffrey Allen, Sandra J Gardner, Karl W Dawson, Peter G Odell, Paul F Smith, Caroline M Turek, Roger E Gaynor, Jeffrey H Banning: Quinacridone nanoscale pigment particles. Xerox Corporation, Oliff & Berridge, September 23, 2008: US07427323 (94 worldwide citation)

A nanoscale pigment particle composition includes a quinacridone pigment including at least one functional moiety, and a sterically bulky stabilizer compound including at least one functional group, wherein the functional moiety associates non-covalently with the functional group; and the presence o ...


James M Duff, Ah Mee Hor, C Geoffrey Allen, Roger E Gaynor, Cheng Kuo Hsiao: Photoconductive imaging members. Xerox Corporation, E O Palazzo, September 11, 2001: US06287738 (7 worldwide citation)

A photoconductive imaging member comprised of a mixture of at least two symmetrical perylene bisimide dimers of Formula 1

Roger E Gaynor, C Geoffrey Allen: Quinacridone nanoscale pigment particles and methods of making same. Xerox Corporation, Oliff & Berridge, May 19, 2009: US07534294 (7 worldwide citation)

A process for preparing coated nanoscale quinacridone pigment particles, includes providing a first solution containing a surface additive compound in an acid; adding a quinacridone pigment precursor or crude quinacridone pigment into the first solution and causing the surface additive compound to c ...