Granted Patent
Utility
US 4,527,583 · App. 06/513,162
Electropneumatic transducer system
Inventor:
Donald C. Simpson
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jul 12, 1983
Inventor
Donald C. Simpson
Assignee (at issue)
Dresser Industries, 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.