Granted Patent
Utility
US 5,077,276 · App. 07/479,183
Growth factor
Inventors:
Francis John Ballard, John C. Wallace, Geoffrey Leonard Francis, Christopher Bagley
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Feb 12, 1990
Inventors
Francis John Ballard
John C. Wallace
Geoffrey Leonard Francis
Christopher Bagley
Assignee (at issue)
Gropep PTY, Ltd.
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.