Granted Patent
Utility
US 4,012,729 · App. 05/588,153
Multi-element ionization chamber
Inventors:
Stephen D. Weaver, Lyman L. Blackwell, Paul A. Staby
Patented Case
View Patent ↗
Granted: Mar 15, 1977
Filed: Jun 19, 1975
Inventors
Stephen D. Weaver
Lyman L. Blackwell
Paul A. Staby
Assignee (at issue)
Statitrol, 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.