Granted Patent
Utility
US 4,811,491 · App. 07/093,017
Two-axis differential capacitance inclinometer
Inventors:
Alan C. Phillips, Terence J. O'Brien
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Sep 4, 1987
Inventors
Alan C. Phillips
Terence J. O'Brien
Assignee (at issue)
Etak, 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.