Granted Patent
Utility
US 4,381,664 · App. 06/206,665
Methods of and apparatus for the detection of airborne particles
Inventors:
Raymond Clark, William Hunt
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Nov 13, 1980
Inventors
Raymond Clark
William Hunt
Assignee (at issue)
Watkins and Watson Limited
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.