Granted Patent
Utility
US 5,954,572 · App. 08/998,279
Constant current apparatus
Inventors:
Peter J. Kettlewell, Julian M. Sparrey, Paul William Griffiths, Ian Weeks
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Dec 24, 1997
Inventors
Peter J. Kettlewell
Julian M. Sparrey
Paul William Griffiths
Ian Weeks
Assignee (at issue)
BTG INTERNATIONAL 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.