Granted Patent
Utility
US 4,913,196 · App. 07/052,620
Fluid injection system pumping methods
Inventors:
Harold R. Williams, Robert M. Spencer
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: May 20, 1987
Inventors
Harold R. Williams
Robert M. Spencer
Assignee (at issue)
Surgikos, 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.