Granted Patent
Utility
US 4,272,267 · App. 06/093,926
Gas filter
Inventors:
Grietinus R. L. Kamps, Jan S. P. Moltzer, Pieter J. Platteeuw
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Nov 13, 1979
Inventors
Grietinus R. L. Kamps
Jan S. P. Moltzer
Pieter J. Platteeuw
Assignee (at issue)
AMERICAN AIR FILTER COMPANY, 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.