Granted Patent
Utility
US 4,838,581 · App. 07/167,115
Joint structure for a tube support plate and a tube
Inventors:
Noriyuki Oda, Tetsuo Takehara, Katsumi Higashi, Keiji Muramatsu
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Mar 11, 1988
Inventors
Noriyuki Oda
Tetsuo Takehara
Katsumi Higashi
Keiji Muramatsu
Assignee (at issue)
ASAHI GLASS 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.