Granted Patent
Utility
US 5,987,664 · App. 09/131,366
Invalid hoists
Inventors:
Bruce Edward Somerton, John Greaves
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Aug 7, 1998
Inventors
Bruce Edward Somerton
John Greaves
Assignee (at issue)
Arjo Limited
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.