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Publication numberUST859005 I4
Publication typeGrant
Publication dateFeb 4, 1969
Filing dateNov 17, 1967
Priority dateNov 17, 1967
Publication numberUS T859005 I4, US T859005I4, US-I4-T859005, UST859005 I4, UST859005I4
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Defensive publication
US T859005 I4
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Description  (OCR text may contain errors)

l 259 (13S DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, S49 O.G. 1221. Identification is by serial number of the application and the heading indicates the number of pages of specification, including claims. and of sheets of drawing contained in the application as originally tiled. The file of this application is available to the public for'inspection; reproduction may be purchased for :30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Omce makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 1, 1969 683,817 ADDITIVE CONTAINING TOBACCO SMOKE FILTER John R. Hatfield, Jr., and Kyle E. Morrison, both of R0. Box 511, Kingsport, Tenn. 37662 Filed Nov. 17, 1967. Published Feb. 4, 1969 Class 131-266 No Drawing. 14 Pages Specification Tobacco smoke filter elements containing particles of anhydrated and/or hydrated magnesium sulfate for removing at least 50 percent of the total particulate matter contained in an effluent stream of tobacco smoke from a cigarette. A majority of the particles have a size of about 2.0 microns and the filter will selectively remove more nicotine than tar from the tobacco smoke.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4964426 *Sep 28, 1988Oct 23, 1990Eastman Kodak CompanyMicroacicular crystals on surfaces
US5150723 *Jun 8, 1990Sep 29, 1992Eastman Kodak CompanyCellulose acetate with surface crystals
U.S. Classification131/342
International ClassificationA24D3/16, A24D3/00
Cooperative ClassificationA24D3/16
European ClassificationA24D3/16