Granted Patent
Utility
US 4,374,322 · App. 06/143,441
Apparatus for controlling the absorption of one or more color components in a dyeing fluid
Inventors:
Erich Hoffmann, Werner Ptaschek
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Apr 24, 1980
Inventors
Erich Hoffmann
Werner Ptaschek
Assignee (at issue)
W. C. Heraeus GmbH
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.