Granted Patent
Utility
US 4,657,479 · App. 06/783,159
Rotor tip clearance control devices
Inventors:
Michael J. Brown, Sharon Martin, Andrew Seaton, Phillip Snowsill, Mark S. Thomas, Hywel Williams
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Oct 2, 1985
Inventors
Michael J. Brown
Sharon Martin
Andrew Seaton
Phillip Snowsill
Mark S. Thomas
Hywel Williams
Assignee (at issue)
ROLLS-ROYCE plc
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.