Granted Patent
Utility
US 4,276,167 · App. 06/034,928
Diffuser arrangements
Inventors:
Johan C. F. C. Richter, Ole J. Richter
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Apr 25, 1979
Inventors
Johan C. F. C. Richter
Ole J. Richter
Assignee (at issue)
Kamyr, 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.