Granted Patent
Utility
US 6,032,750 · App. 08/945,677
Drilling tool having a drill bit with primary and secondary cutting edges
Inventors:
Heinrich Kersten, Hartmut Precht
Patented Case
View Patent ↗
Granted: Mar 7, 2000
Filed: Feb 4, 1998
Inventors
Heinrich Kersten
Hartmut Precht
Assignee (at issue)
Gebrueder Heller Dinklage GmbH
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.