Granted Patent
Utility
US 4,720,306 · App. 06/852,131
Cleaning method
Inventors:
Hermann Emmert, Herbert Hehs, Detlev Coerlin, Klaus Kuhnke
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Apr 15, 1986
Inventors
Hermann Emmert
Herbert Hehs
Detlev Coerlin
Klaus Kuhnke
Assignee (at issue)
Kraftwerk Union Aktiengesellschaft
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.