Granted Patent
Utility
US 4,643,631 · App. 06/725,858
Quick coupling and release mechanism for buckets
Inventors:
Herman J. Maurer, John F. Shumaker
Patented Case
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Granted: Feb 17, 1987
Filed: Apr 22, 1985
Inventors
Herman J. Maurer
John F. Shumaker
Assignee (at issue)
J. I. Case 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.