Granted Patent
Utility
US 6,402,829 · App. 09/741,389
Process for preparing a substantially pure gamma phase quinacridone pigment of large particle size
Inventors:
Edward Sung, George H. Robertson, Humberto Velasquez
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Dec 20, 2000
Inventors
Edward Sung
George H. Robertson
Humberto Velasquez
Assignee (at issue)
Sun Chemical Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.