Granted Patent
Utility
US 4,899,664 · App. 07/012,608
Split workhead
Inventors:
Roy Moore, Calvin L. Coy
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Feb 9, 1987
Inventors
Roy Moore
Calvin L. Coy
Assignee (at issue)
Tamper Limited
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.