Granted Patent
Utility
US 6,005,999 · App. 08/975,843
Waveguide narrowband rejection filter
Inventors:
Harmeet Singh, Charles Haggans, Wayne F. Varner
Patented Case
View Patent ↗
Granted: Dec 21, 1999
Filed: Nov 21, 1997
Inventors
Harmeet Singh
Charles Haggans
Wayne F. Varner
Assignee (at issue)
3M INNOVATIVE PROPERTIES COMPANY
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.