Granted Patent
Utility
US 6,587,306 · App. 09/588,372
Tape cassette of high transparency material
Inventors:
Shigeru Ishikawa, Hiroyuki Umeda, Hisashige Fujiwara, Yasufumi Hashimoto
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Jun 7, 2000
Inventors
Shigeru Ishikawa
Hiroyuki Umeda
Hisashige Fujiwara
Yasufumi Hashimoto
Assignee (at issue)
Victor Company of Japan, 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.