Granted Patent
Utility
US 4,531,402 · App. 06/490,533
Apparatus and method for measuring the concentration of large particles in a gas
Inventors:
Robert B. Reif, Loren R. Albrechtson
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: May 2, 1983
Inventors
Robert B. Reif
Loren R. Albrechtson
Assignee (at issue)
Battelle 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.