Granted Patent
Utility
US 5,262,021 · App. 08/006,939
Method of manufacturing a perforated workpiece
Inventors:
Volker Lehmann, Hans Reisinger
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Jan 21, 1993
Inventors
Volker Lehmann
Hans Reisinger
Assignee (at issue)
Siemens Aktiengesellschaft
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.