Granted Patent
Utility
US 4,333,170 · App. 05/853,207
Acoustical detection and tracking system
Inventors:
Lemuel P. Mathews, Charles A. Lohman, Paul R. Armstrong
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Nov 21, 1977
Inventors
Lemuel P. Mathews
Charles A. Lohman
Paul R. Armstrong
Assignee (at issue)
Northrop Corporation
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.