Granted Patent
Utility
US 4,488,044 · App. 06/323,471
Ionization chamber for smoke detector and the like
Inventors:
Gerald D. Rork, Edward J. Thorp, Ronald J. Zegarski
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Nov 20, 1981
Inventors
Gerald D. Rork
Edward J. Thorp
Ronald J. Zegarski
Assignee (at issue)
Pittway Corporation
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.