Granted Patent
Utility
US 5,571,948 · App. 08/445,756
Pressurized air tank air quality tester
Inventors:
Lawrence M. Kaplan, Robert Laughlin
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: May 22, 1995
Inventors
Lawrence M. Kaplan
Robert Laughlin
Assignee (at issue)
LAWRENCE FACTOR, 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.