Granted Patent
Utility
US 4,896,937 · App. 07/227,220
Optical fiber switch
Inventors:
Richard T. Kraetsch, Richard J. Pimpinella, Leonard W. Schaper, King Lien Tai
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Aug 2, 1988
Inventors
Richard T. Kraetsch
Richard J. Pimpinella
Leonard W. Schaper
King Lien Tai
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Bell Laboratories
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.