Tobacco smoke filter

US6792953B2 · kind B2 · utility

Assignee

• Filligent Limited · CN

Inventors

• Craig Lesser · Los Angeles, US
• Reid W. von Borstel · Potomac, US

Key dates

• Filing date: Mar 10, 2003
• Grant date: Sep 21, 2004
• Expiry date: Mar 10, 2023

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A24D3/16
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A tobacco smoke filter a copper-containing porphyrin or an iron analog of C.I. Reactive Blue 21 dye. A method of making a first tobacco smoke filter segment, comprising the steps of, first, providing one or more than one substance; producing a mixture of cellulose fiber and the substance; heating the mixture for a sufficient time at one or more than one temperature sufficient to covalently link the substance to the cellulose fiber; and forming the cellulose fiber with covalently bound substance into the first tobacco smoke filter segment. The substance can be a copper-containing porphyrin or an iron analog of C.I. Reactive Blue 21 dye.