Granted Patent
Utility
US 5,149,241 · App. 07/684,423
Dual mast apparatus for storage and retrieval vehicles
Inventors:
Ralph B. Haymore, Mark I. Johnson
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Apr 12, 1991
Inventors
Ralph B. Haymore
Mark I. Johnson
Assignee (at issue)
Eaton-Kenway, Inc.
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.