Compounds, processes and marking systems

Details Compounds, processes and marking systems Compounds, processes and marking systems

1982-11-05

1985-09-03

Hess, Bruce H.

Recorders

Record receiver deforming

346220, 346223, 427151, B41M 520

Patent

active

045395799

ABSTRACT:
This invention relates to mono- and bis(aryl- and/or heteroaryl)-substituted-phthalazinones, phthalimidines, pyridopyridazinones and pyrrolopyridinones useful as color-forming substances, particularly in electrochromic recording systems, which are prepared by the interaction of a mono- or bis-substituted-phthalide or furopyridinone with a substituted or unsubstituted hydrazine.

REFERENCES:
patent: 3974041 (1976-08-01), Haruta et al.
patent: 4012292 (1977-03-01), Fujiuara et al.
patent: 4017366 (1977-04-01), Hsieh et al.
Kuzuya, M.; Usui, T.; Ito, S.; Miyake, F.; Nozawa, S.; & Okuda, T., Chemical Pharmaceutical Bulletin, 1980, 28, (12), 3561-9.

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