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:
Aug. 23, 2005
Filed:
Apr. 12, 2001
Roderick Mcdonald, Strathcylde, GB;
Robert Dornan, Strathclyde, GB;
Roderick McDonald, Strathcylde, GB;
Robert Dornan, Strathclyde, GB;
J & P Coats Limited, Glasgow Strathclyde, GB;
Abstract
A method for making a dye mixture to produce a target colour on a given substrate, comprising the steps of: −a) measuring reflectance values R(λ) of the target colour at a plurality of wavelengths λ=1, 2 . . . n; b) measuring reflectance values R(λ) of the substrate at the same wavelengths λ; forming a set of concentrations cof M dyes in the calculated concentrations; the database having been compiled by aa) making dyeings of combinations of the dyes Dn at different concentrations; bb) measuring the reflectance values R of the dyeings at different wavelengths; cc) defining a function f(R); dd) defining a relationship between f(R) and c involving constants g and k; and ee) for each dye Dn determining constants g, k, such that the calculated values for f(R), c, gkapproximate closely the measured values.