Granted Patent
Utility
US 4,697,888 · App. 06/370,434
Frequency shifted cavity for electromagnetic radiation
Inventors:
Donald Schmadel, William H. Culver
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Apr 21, 1982
Inventors
Donald Schmadel
William H. Culver
Assignee (at issue)
Chevron Research 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.