Granted Patent
Utility
US 4,834,828 · App. 07/044,331
Machine for welding roof membranes
Inventor:
Colin Murphy
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Apr 30, 1987
Inventor
Colin Murphy
Assignee (at issue)
Engineered Construction Components
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.