Granted Patent
Utility
US 4,756,899 · App. 07/014,422
Manufacture of high purity low arsenic anhydrous hydrogen fluoride
Inventors:
Theodore J. Jenczewski, Robert L. Sturtevant, Thomas R. Morgan, Barry J. Boghean, Donald C. Butt
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Feb 12, 1987
Inventors
Theodore J. Jenczewski
Robert L. Sturtevant
Thomas R. Morgan
Barry J. Boghean
Donald C. Butt
Assignee (at issue)
AlliedSignal, 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.