Granted Patent
Utility
US 4,437,642 · App. 06/353,575
Lift system for tilt-up walls
Inventor:
Neil L. Holt
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Mar 1, 1982
Inventor
Neil L. Holt
Assignee (at issue)
Burke, 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.