Granted Patent
Utility
US 4,468,951 · App. 06/459,953
Permeation testing apparatus
Inventors:
David B. Garcia, Bruce A. Sorenson, Lawrence H. Keith, James M. Harless, Douglas B. Walters, Andrew T. Prokopetz
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jan 21, 1983
Inventors
David B. Garcia
Bruce A. Sorenson
Lawrence H. Keith
James M. Harless
Douglas B. Walters
Andrew T. Prokopetz
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.