Granted Patent
Utility
US 4,672,168 · App. 05/954,404
Apparatus for perforating sheet material
Inventors:
Richard J. Saunders, Derek L. Hine, Gerald C. Barker
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Oct 25, 1978
Inventors
Richard J. Saunders
Derek L. Hine
Gerald C. Barker
Assignee (at issue)
Coherent, 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.