Granted Patent
Utility
US 4,540,184 · App. 06/694,261
Sand-filled sealing structure between at least one tube and a tube support plate
Inventors:
Kunio Takahashi, Noriyuki Oda, Nobuyuki Kido, Keizi Muramatsu
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jan 24, 1985
Inventors
Kunio Takahashi
Noriyuki Oda
Nobuyuki Kido
Keizi 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.