Granted Patent
Utility
US 4,474,472 · App. 06/288,940
Arrangement for the detection of particles in a gas flow
Inventor:
Hans Winter
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Jul 31, 1981
Inventor
Hans Winter
Assignee (at issue)
Siemens Aktiengesellschaft
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.