Granted Patent
Utility
US 6,183,170 · App. 09/273,298
Cylindrical cutting device
Inventors:
Wolfgang Wald, Martina Stuckardt, Ernst Heiderich, Reinhold Walter
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Mar 19, 1999
Inventors
Wolfgang Wald
Martina Stuckardt
Ernst Heiderich
Reinhold Walter
Assignee (at issue)
Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik
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.