Granted Patent
Utility
US 5,180,752 · App. 07/490,332
Process for making dry microspheres
Inventors:
George E. Melber, Leon E. Wolinski, William A. Oswald
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Mar 8, 1990
Inventors
George E. Melber
Leon E. Wolinski
William A. Oswald
Assignee (at issue)
Pierce & Stevens 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.