Granted Patent
Utility
US 4,840,047 · App. 07/195,670
Multiscreen pressure diffuser
Inventors:
Johan C. F. C. Richter, Ole J. Richter
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: May 18, 1988
Inventors
Johan C. F. C. Richter
Ole J. Richter
Assignee (at issue)
Kamyr AB
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.