Granted Patent
Utility
US 4,536,644 · App. 06/680,389
Arrangement for welding together thermoplastic molded members
Inventor:
Alfred Thalmann
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Dec 11, 1984
Inventor
Alfred Thalmann
Assignee (at issue)
Georg Fischer LLC
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.