Granted Patent
Utility
US 4,680,898 · App. 06/716,926
Method and apparatus for cleaning workpieces
Inventor:
James H. Carpenter
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Apr 1, 1985
Inventor
James H. Carpenter
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.