Granted Patent
Utility
US 6,576,905 · App. 09/881,644
Method and assembly for gas detection via a convergent birefringent filter
Inventors:
Harold S. Lessure, Richard A. Evans, Richard P. Kunkle, Dale M. Matuza
Patented Case
View Patent ↗
Granted: Jun 10, 2003
Filed: Jun 14, 2001
Inventors
Harold S. Lessure
Richard A. Evans
Richard P. Kunkle
Dale M. Matuza
Assignee (at issue)
Gas Research Institute
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.