Granted Patent
Utility
US 5,218,653 · App. 07/790,668
Polarization converter with apodized acoustic waveguide
Inventors:
John J. Johnson, David A. Smith
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Nov 8, 1991
Inventors
John J. Johnson
David A. Smith
Assignee (at issue)
Bell Communications Research, Inc.
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.