The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 1976
Filed:
Apr. 17, 1974
Hideo Usui, Minami-ashigara, JA;
Sadao Ishige, Minami-ashigara, JA;
Teruo Kobayashi, Minami-ashigara, JA;
Keiso Saeki, Fujimiya, JA;
Fuji Photo Film Co., Ltd., Minami-ashigara, JA;
Abstract
A 1,3-dihydro-1-oxo-benzo[b]thieno[2,3-C]furan derivative represented by the following General Formula I ##SPC1## or a 1,3-dihydro-3-oxo-benzo[b]thieno[2,3-C]furan derivative represented by the following General Formula II: ##SPC2## wherein ring A represents a benzene ring or a naphthalene ring, R.sub.1 and R.sub.2 each represents an amino group, and X, Y and Z each represents a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkoxy group, an aralkoxy group, an acyloxy group, a nitro group or an amino group, useful as a color former, e.g., in a pressure sensitive copying paper.