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. 01, 1985
Filed:
Apr. 18, 1984
Applicant:
Inventors:
Derek J Newport, Newcastle, GB;
Christopher Hood, Reading, GB;
Assignee:
Johnson Matthey Public Limited Company, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235487 ; 235375 ; 235380 ;
Abstract
A portable credit device for use in a credit control system has an electrochromic cell display, which contains a transition metal oxide that can color cathodically by reduction or anodically by oxidation. This enables a permanent, unpowered memory to be achieved. A credit control system is also disclosed in which the portable credit device can be used.