Granted Patent
Utility
US 6,221,189 · App. 09/199,500
Method for manufacturing thermoplastic tubes
Inventors:
Ronald E. Kieras, John J. Rhoades
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Nov 25, 1998
Inventors
Ronald E. Kieras
John J. Rhoades
Assignee (at issue)
Thatcher Tubes 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.