Granted Patent
Utility
US 5,423,995 · App. 08/208,214
Piezoceramic material having high piezoelectric activity and high dielectric constant
Inventors:
Gunter Helke, Hans-Joachim Langer
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Mar 10, 1994
Inventors
Gunter Helke
Hans-Joachim Langer
Assignee (at issue)
Hoechst 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.