Granted Patent
Utility
US 4,324,568 · App. 06/177,234
Method and apparatus for the leak testing of filters
Inventors:
David E. Wilcox, Thomas Allan
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Aug 11, 1980
Inventors
David E. Wilcox
Thomas Allan
Assignee (at issue)
FLANDERS FILTERS, 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.