Granted Patent
Utility
US 6,669,027 · App. 09/273,687
Vibratory screening machine and vibratory screen and screen tensioning structure
Inventors:
James A. Mooney, Keith Wojciechowski
Patented Case
View Patent ↗
Granted: Dec 30, 2003
Filed: Mar 22, 1999
Inventors
James A. Mooney
Keith Wojciechowski
Assignee (at issue)
Derrick Manufacturing Corporation
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.