Granted Patent
Utility
US 5,165,523 · App. 07/813,004
Selectively removable block and pusher assembly and feed chain therefor
Inventors:
Robert Wooley, A. Derrell Hightower
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Dec 24, 1991
Inventors
Robert Wooley
A. Derrell Hightower
Assignee (at issue)
National Service Industries, 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.