Granted Patent
Utility
US 4,255,140 · App. 06/045,818
Apparatus and method for dental impressions
Inventor:
Kenneth H. Marshall
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Jun 6, 1979
Inventor
Kenneth H. Marshall
Assignee (at issue)
Johnson & Johnson Dental Products Company
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.