Patent · US Active

Filter

US9078471B2 · kind B2 · utility

1Cited by

13References

15Claims

0Family size

Assignee

British American Tobacco (Investments) Limited · GB

Inventors

John Sampson · London, GB
David L. Lewis · London, GB

Key dates

Filing date	May 30, 2013
Grant date	Jul 14, 2015
Priority date	—
Expiry date	May 30, 2033

Classification

Technology area (CPC A)Human Necessities
CPC primaryA24D3/063
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A filter for a cigarette comprises a porous material sheet wrapped around the filter rod and a cellulose acetate thread formed tram substantially uncrimped cellulose acetate filaments. The cellulose acetate thread is positioned within the filter rod and extends along the central axis of the filter rod.

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