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:
Oct. 17, 1978
Filed:
Sep. 30, 1977
Applicant:
Inventor:
Sylvester Charles Sviokla, Ocean Bluff, MA (US);
Assignee:
Alden Research Foundation, Westboro, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; G01D / ; G01D / ;
U.S. Cl.
CPC ...
204-2 ; 427151 ;
Abstract
An improved electrochemical recording medium is provided which comprises a support impregnated with an electrolytically conducting solution containing an electrolyte, a chelating or sequestering agent, and a marking compound; and characterized by the inclusion of a six-membered hetero-aromatic nitrogen-containing compound having at least one acidic substituant adjacent to a nitrogen atom of the hetero-aromatic ring. The hetero-aromatic compound unexpectedly provides improvement in color, tone and definition of recorded mark.