Granted Patent
Utility
US 4,997,634 · App. 07/517,778
Preparation of medium density, fast-dissolving, tetrasodium pyrophosphate
Inventor:
Paul L. Hensler
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: May 2, 1990
Inventor
Paul L. Hensler
Assignee (at issue)
FMC CORPORATION
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.