Granted Patent
Utility
US 6,565,498 · App. 09/848,593
Composite roll for manufacturing heat transfer tubes
Inventors:
Isao Nakada, Takao Kobayashi
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: May 3, 2001
Inventors
Isao Nakada
Takao Kobayashi
Assignee (at issue)
FUJI DIE CO., LTD.
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.