Granted Patent
Utility
US 6,264,064 · App. 09/418,084
Chemical delivery system with ultrasonic fluid sensors
Inventors:
Charles Michael Birtcher, Thomas Andrew Steidl, Martin Castaneda Martinez, Jamshid Jay Hamidi
Patented Case
View Patent ↗
Granted: Jul 24, 2001
Filed: Oct 14, 1999
Inventors
Charles Michael Birtcher
Thomas Andrew Steidl
Martin Castaneda Martinez
Jamshid Jay Hamidi
Assignee (at issue)
Air Products and Chemicals, 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.