Granted Patent
Utility
US 4,878,841 · App. 06/876,115
Periodontal probe
Inventors:
Christopher A. G. McCulloch, Peter Birek
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Jun 19, 1986
Inventors
Christopher A. G. McCulloch
Peter Birek
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.