Granted Patent
Utility
US 5,331,400 · App. 07/888,225
Heterodyne interferometer arrangement
Inventors:
Gunther Wilkening, Wenmei Hou
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: May 21, 1992
Inventors
Gunther Wilkening
Wenmei Hou
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.