Granted Patent
Utility
US 4,379,991 · App. 06/135,191
Apparatus for accurately measuring the volume of a meter prover
Inventors:
William Wai Yan Ho, William F. Hall
Patented Case
View Patent ↗
Granted: Apr 12, 1983
Filed: Mar 28, 1980
Inventors
William Wai Yan Ho
William F. Hall
Assignee (at issue)
Rockwell International 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.