Granted Patent
Utility
US 6,615,931 · App. 10/043,081
Continuous feed drilling system
Inventors:
William V. Dycus, Louis E. Silay
Patented Case
View Patent ↗
Granted: Sep 9, 2003
Filed: Jan 7, 2002
Inventors
William V. Dycus
Louis E. Silay
Assignee (at issue)
Boart Longyear 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.