Granted Patent
Utility
US 4,259,856 · App. 06/026,570
Combination locks and dial-indexing spring therefor
Inventor:
Rudolf Wingert
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Apr 3, 1979
Inventor
Rudolf Wingert
Assignee (at issue)
Presto Lock Company, Division of Walter Kidde & Company, 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.