Granted Patent
Utility
US 4,189,340 · App. 05/923,024
Method of fusion welding of thermoplastic components
Inventor:
Raymond K. Newkirk
Patented Case
View Patent ↗
Granted: Feb 19, 1980
Filed: Jul 7, 1978
Inventor
Raymond K. Newkirk
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.