Inventor
OBITSU TAKEO
JP6 patents
Patents
6 patentsUS4687862AAug 18, 1987
Fluoran compounds
SHIN NISSO KAKO CO LTD15 citations80
US4680598AJul 14, 1987
Chromogenic materials employing fluoran compounds
SHIN NISSO KAKO CO LTD16 citations80
US4954631ASep 4, 1990
Fluoran compounds and color forming recording materials using same
SHIN NISSO KAKO CO LTD4 citations59
US4826806AMay 2, 1989
Fluoran compounds and color forming recording materials using same
SHIN NISSO KAKO CO LTD3 citations59
US4668967AMay 26, 1987
Fluoran compound and color forming record materials using the same
SHIN NISSO KAKO CO LTD3 citations59
US4794069ADec 27, 1988
Spirobenzanthracene phthalide compounds, processes for preparing same and color forming recording materials containing said compounds
SHIN NISSO KAKO CO LTD0 citations49