Granted Patent
Utility
US 4,509,153 · App. 06/349,524
Resolution transducers, systems and methods for the transmission and/or reception of waves propagated by vibration
Inventor:
John P. Weight
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Feb 17, 1982
Inventor
John P. Weight
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.