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. 02, 2012
Filed:
Jan. 14, 2005
Applicants:
Nazir Khan, Nottingham, GB;
Martin Robert Walker, Cheshire, GB;
Inventors:
Nazir Khan, Nottingham, GB;
Martin Robert Walker, Cheshire, GB;
Assignee:
Datalase Ltd., Widnes, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M 5/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ink formulation comprises a marking component and a metal salt that absorbs laser irradiation at 700-2000 mn and thereby causes the marking component to change colour. A copper salt in particular allows effective marking with a diode or COlaser.