Granted Patent
Utility
US 4,602,653 · App. 06/667,141
Electronically-controlled gas blending system
Inventors:
Alberto Ruiz-Vela, Maurice Brooks, Douglas F. DeVries
Patented Case
View Patent ↗
Granted: Jul 29, 1986
Filed: Nov 1, 1984
Inventors
Alberto Ruiz-Vela
Maurice Brooks
Douglas F. DeVries
Assignee (at issue)
Bear Medical Systems, 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.