Granted Patent
Utility
US 5,228,623 · App. 07/817,463
Airport runway cleaning method and apparatus
Inventors:
Chidambaram Raghavan, John H. Olsen
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Jan 3, 1992
Inventors
Chidambaram Raghavan
John H. Olsen
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.