Granted Patent
Utility
US 5,389,785 · App. 08/054,523
ION filter apparatus and method of production thereof
Inventors:
Urs Steiner, Nigel P. Gore, Helmut Rother
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Apr 28, 1993
Inventors
Urs Steiner
Nigel P. Gore
Helmut Rother
Assignee (at issue)
Finnigan Corporation (a Virginia 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.