Granted Patent
Utility
US 4,753,536 · App. 07/023,838
Dispensing mixer for the storage and mixing of separate materials
Inventors:
Edward R. Spehar, Bernard F. Harkins, Laurence Colin
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Mar 9, 1987
Inventors
Edward R. Spehar
Bernard F. Harkins
Laurence Colin
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.