Granted Patent
Utility
US 6,491,953 · App. 09/479,764
Controlled release compositions and method
Inventors:
Milan F. Sojka, Ralph Spindler
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jan 7, 2000
Inventors
Milan F. Sojka
Ralph Spindler
Assignee (at issue)
AMCOL INTERNATIONAL 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.