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:
Sep. 14, 1982
Filed:
Oct. 03, 1979
Applicant:
Inventors:
Robert Garner, Bury, Lancashire BL8 4HG, GB;
Jean C Petitpierre, 4303 Kaiseraugst, CH;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M / ; B41M / ; B41M / ;
U.S. Cl.
CPC ...
282 275 ; 427151 ; 427152 ; 428537 ; 428913 ; 428914 ; 4283208 ; 430200 ; 430348 ;
Abstract
Fluoran compounds of the formula ##STR1## wherein one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents n-alkyl having 6 to 12 carbon atoms and the other R's, independently of each other, represent hydrogen, alkyl having 1 to 12 carbon atoms, alkoxyalkyl having 2 to 8 carbon atoms or benzyl optionally substituted in the ring by nitro, halogen or alkyl having 1 to 6 carbon atoms. The fluoran compounds are particularly useful as color formers which give intense dark green color when they are brought into contact with an electron-accepting co-reactant.