Granted Patent
Utility
US 4,501,988 · App. 06/364,466
Ethylene quenched multi-cathode Geiger-Mueller tube with sleeve-and-screen cathode
Inventors:
Nicholas M. Mitrofanov, Victor G. Berner
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Apr 1, 1982
Inventors
Nicholas M. Mitrofanov
Victor G. Berner
Assignee (at issue)
Harshaw/Filtrol Partnership
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.