Microporous materials in cigarette filter construction

Patent 4729391 Issued on March 8, 1988. Estimated Expiration Date:

November 14, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Filter elements
Patent #: 3939849
Issued on: 02/24/1976
Inventor: Baxter , et al.

Microporous styrene polymers and method of making same
Patent #: 4002177
Issued on: 01/11/1977
Inventor: Rainer , et al.

Production of tobacco smoke filters
Patent #: 4281671
Issued on: 08/04/1981
Inventor: Bynre , et al.

Open cell structure foamed cellulose acetate filters Patent #: 4282890
Issued on: 08/11/1981
Inventor: Howell, Jr. , et al.

Inventors

Assignee

R. J. Reynolds Tobacco Company

Application

No. 06/798227 filed on 11/14/1985

US Classes:

131/332, Having a polymer131/335By adding constituent to smoke stream

Examiners

Primary: Millin, V.
Assistant: Macey, H.

International Classes

A24D 3/00 (20060101)
A24D 3/06 (20060101)
A24D 3/08 (20060101)
A24D 3/10 (20060101)

Abstract

Flavor-carrying microporous polymer material is incorporated with a cigarette filter to release flavor into the smoke-stream during smoking of the cigarette.