Granted Patent
Utility
US 5,134,810 · App. 07/695,414
Mobile outside surface pipe cleaner
Inventor:
James H. Carpenter
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: May 3, 1991
Inventor
James H. Carpenter
Assignee (at issue)
Pangborn 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.