Granted Patent
Utility
US 5,139,502 · App. 07/465,122
Drainage tube for sinus maxillaris, a means for its insertion and a means for making a hole for its positioning
Inventors:
Olle Berg, Lars Lejdeborn
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Feb 16, 1990
Inventors
Olle Berg
Lars Lejdeborn
Assignee (at issue)
Atos Medical AB
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.