Granted Patent
Utility
US 4,441,671 · App. 06/442,298
Take-off ramps for aircraft
Inventors:
Douglas C. Thorby, Michael C. Sullivan
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Nov 17, 1982
Inventors
Douglas C. Thorby
Michael C. Sullivan
Assignee (at issue)
British Aerospace Public Limited Co.
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.