Patent · US Active

Cellulose acetate fiber modification

US7878210B2 · kind B2 · utility

1Cited by

31References

12Claims

0Family size

Assignee

Philip Morris USA Inc. · US

Inventors

Peter Lipowicz · Midlothian, US
Shalva Gedevanishvili · Richmond, US
Lixin Xue · Midlothian, US
Milton E. Parrish · Midlothian, US
Vicki L. Baliga · Midlothian, US

Key dates

Filing date	May 30, 2008
Grant date	Feb 1, 2011
Priority date	—
Expiry date	Jul 31, 2029

Classification

Technology area (CPC A)Human Necessities
CPC primaryA24D3/064
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

Cellulose acetate fibers can be modified to have physical imperfections and then incorporated into cigarette filter plugs as filtering materials. Cellulose acetate fiber modification can be achieved by etching with a gas phase etchant or a liquid phase etchant comprising hydrogen peroxide. Modification of cellulose acetate fibers may be performed at various stages during the manufacture of cigarette filter plugs. Furthermore, cigarette filter plugs containing modified cellulose acetate fibers can also have spaced apart slits along the length of the cigarette filter plugs.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.