Patent · US Active

Filter

US10334875B2 · kind B2 · utility

0Cited by

14References

20Claims

0Family size

Assignee

British American Tobacco (Investments) Limited · GB

Inventors

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

Key dates

Filing date	Jun 12, 2015
Grant date	Jul 2, 2019
Priority date	—
Expiry date	Jun 12, 2035

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 fitter rod and a material sheet wrapped around the filter rod and a cellulose acetate thread formed from 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.