Granted Patent
Utility
US 5,148,097 · App. 07/686,753
Apparatus for stepless control of electric loads by the phase angle principle and brightness controller using the apparatus
Inventor:
Dieter Draxelmayr
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Apr 17, 1991
Inventor
Dieter Draxelmayr
Assignee (at issue)
Siemens 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.