Granted Patent
Utility
US 4,917,181 · App. 07/228,340
Segmented annular recuperator and method
Inventors:
John D. Kiernan, Jr., Frederick Sembler
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Aug 4, 1988
Inventors
John D. Kiernan, Jr.
Frederick Sembler
Assignee (at issue)
Textron Lycoming
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.