Granted Patent
Utility
US 4,916,325 · App. 07/250,256
Method and apparatus for the measurement of airborne fibres by the illumination of fibrous particles precipitated on a surface
Inventors:
Anthony P. Rood, Edward J. Walker
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Sep 27, 1988
Inventors
Anthony P. Rood
Edward J. Walker
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.