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:
Nov. 07, 1995
Filed:
Jan. 19, 1994
Applicant:
Inventors:
Richard B Jotcham, Wiltshire, GB;
Gerald S Payne, Bath, GB;
Assignee:
Portals (Bathford) Limited, Bath, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; B42D / ;
U.S. Cl.
CPC ...
380 54 ; 380 59 ; 283 72 ; 283 85 ;
Abstract
A security thread (11) for use in security articles (10), includes a substrate having a coating on one or both sides thereof, the coating containing a thermochromic material selected from pigments and dyestuffs which changes from coloured to colourless when the temperature of the pigment or dyestuff is changed to the activation temperature. The thermochromic material may be coloured when the temperature is below the activation temperature and become colourless when the material is at the activation temperature or above. The thread (11) is for security paper (10) for use in producing banknotes and the like.