Granted Patent
Utility
US 4,722,943 · App. 07/028,119
Composition and process for drying and expanding microspheres
Inventors:
George E. Melber, William A. Oswald, Leon E. Wolinski
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Mar 19, 1987
Inventors
George E. Melber
William A. Oswald
Leon E. Wolinski
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.