Granted Patent
Utility
US 6,354,774 · App. 09/559,277
Forstner drill bit
Inventors:
Keith Louis Haughton, Glenn Wallace Haughton, Mao Sheng Yan
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Apr 27, 2000
Inventors
Keith Louis Haughton
Glenn Wallace Haughton
Mao Sheng Yan
Assignee (at issue)
THE MIBRO GROUP
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.