Granted Patent
Utility
US 6,484,540 · App. 09/581,734
Method for welding a quartz glass tube for use as an optical fiber preform
Inventors:
Atsuhi Shimada, Toshiyuki Kato, Masanori Suzuki, Yutaka Watabe
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Aug 11, 2000
Inventors
Atsuhi Shimada
Toshiyuki Kato
Masanori Suzuki
Yutaka Watabe
Assignees (at issue)
HERAEUS QUARZGLAS GMBH & CO. KG
SHIN-ETSU QUARTZ PRODUCTS 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.