Granted Patent
Utility
US 5,234,587 · App. 07/905,742
Gradient system
Inventors:
Robert W. Allington, Daniel G. Jameson
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Jun 29, 1992
Inventors
Robert W. Allington
Daniel G. Jameson
Assignee (at issue)
Isco, 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.