Granted Patent
Utility
US 4,602,691 · App. 06/618,113
Diamond drill bit with varied cutting elements
Inventor:
Gary E. Weaver
Patented Case
View Patent ↗
Granted: Jul 29, 1986
Filed: Jun 7, 1984
Inventor
Gary E. Weaver
Assignee (at issue)
Hughes Tool Company LLC
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.