Granted Patent
Utility
US 6,183,648 · App. 09/054,284
Process for purification of organic sulfonates and novel product
Inventors:
William G. Kozak, Daniel Riley
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Apr 2, 1998
Inventors
William G. Kozak
Daniel Riley
Assignee (at issue)
GEO Specialty Chemicals, Inc.
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.