Granted Patent
Utility
US 5,183,365 · App. 07/689,794
Boring and surfacing machine
Inventor:
George R. Silk
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: May 24, 1991
Inventor
George R. Silk
Assignee (at issue)
Silk Engineering (Derby) 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.