Granted Patent
Utility
US 5,222,087 · App. 07/872,405
TTG-DFB laser diode
Inventors:
Wolfgang Thulke, Stefan Illek
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Apr 23, 1992
Inventors
Wolfgang Thulke
Stefan Illek
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.