Granted Patent
Utility
US 5,975,818 · App. 08/794,651
Grating lift pad
Inventors:
Michael K. Burke, Walter J. Peach
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: Feb 3, 1997
Inventors
Michael K. Burke
Walter J. Peach
Assignee (at issue)
ZefTek, 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.