Granted Patent
Utility
US 4,588,873 · App. 06/540,772
Ultrasonic control of welding
Inventors:
Robert W. Fenn, III, Raymond R. Stroud
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Oct 7, 1983
Inventors
Robert W. Fenn, III
Raymond R. Stroud
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.