Granted Patent
Utility
US 4,750,253 · App. 06/944,116
Method and apparatus for producing a flat spiral link assembly
Inventors:
Fritz Bleher, Klaus Esser, Hans-Eugen Hacker, Rudi Hess-Bauer, Eugen Kehrer, Hartmut Waldvogel
Patented Case
View Patent ↗
Granted: Jun 14, 1988
Filed: Dec 22, 1986
Inventors
Fritz Bleher
Klaus Esser
Hans-Eugen Hacker
Rudi Hess-Bauer
Eugen Kehrer
Hartmut Waldvogel
Assignee (at issue)
Hermann Wangner GmbH & Co. KG
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.