Granted Patent
Utility
US 5,286,451 · App. 08/064,366
Apparatus for controlled delivery of particulate material
Inventors:
K. Nimalasiri De Silva, Roger Guevremont
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: May 21, 1993
Inventors
K. Nimalasiri De Silva
Roger Guevremont
Assignee (at issue)
Her Majesty the Queen in right of Canada, as represented by the Minister of Energy, Mines and Resources Canada
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.