Granted Patent
Utility
US 5,629,028 · App. 08/551,863
Underwater pelletizer having sealed heat transfer tubes embedded in extrusion die
Inventor:
Walter A. Trumbull
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Nov 7, 1995
Inventor
Walter A. Trumbull
Assignee (at issue)
CONAIR 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.