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Publication numberUS2792006 A
Publication typeGrant
Publication dateMay 14, 1957
Filing dateMay 23, 1955
Priority dateOct 8, 1954
Publication numberUS 2792006 A, US 2792006A, US-A-2792006, US2792006 A, US2792006A
InventorsIvo Marek Jan
Original AssigneeAnders Jordahl
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filters and filter material for use in filtering tobacco smoke
US 2792006 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Uni t e Pate tQ FILTERS AND FILTER MATERIAL FOR USE IN FILTERING TOBACCO SMOKE Jan Ivo Marek, Margate, England, assignor of one-half to Anders Jordahl, New York, N. Y.

No Drawing. Application May 23, 1955, Serial No. 510,538

Claims priority, application Great Britain October 8, 1954 Claims. (Cl. 131--10) This invention relates to filter material for use in filtering tobacco smoke and to filters incorporating this material.

There has recently been considerable research in various countries concerning the effects of tobacco smoke on the human lungs and other vital organs and it has been demonstrated that tobacco smoke has a tendency to produce lung cancer and may also have a bad effect on the heart and other organs.

The alleged carcinogenic substances in tobacco smoke include certain aromatic hydrocarbons comprising dibenzanthracene II and benzpyrene, nicotine and other compounds. It is desirable to remove these carcinogenic substances from the smoke as far as possible while allowing non-toxic constituents of the smoke to pass to the smoker. Various filters having a purely mechanical action have been proposed but since some at least of the carcinogenic substances are gaseous in tobacco smoke these filters do not provide effective protection for the smoker. The object of the invention is to provide filter material capable of absorbing substantial proportions of the carcinogenic substances.

The filter material in accordance with the invention comprises cellulosic material to effect mechanical filtering of the smoke in combination with carbon in porous or finely divided form and of at least 96% purity, and preferably of at least 99% purity, the carbon being obtained by a wet process from lignin produced in the manufacture of paper by the soda process and heated with concentrated sulphuric acid at a temperature of over 220 C. e. g. for five to six hours, the carbon being treated subsequently with steam.

The treatment to which the carbon is subjected in accordance with the present invention differs in only limited respects from that described in applicants copending application, Serial No. 232,162, filed June 18, 1951, now abandoned, and reference may be had to that specification for a more complete understanding thereof. Essentially, it is suggested there that the residual liquor obtained in the manufacture of paper pulp according to the well known caustic soda process, which liquor contains lignin as its principal solid constituent, is concentrated by evaporation of water to a thick paste and the paste is treated with a weak acid, such as sulphuric or hydrochloric acid of 16-22 B., in large enough quantities to precipitate the lignin. The lignin is separated by decantation, filtered and dried at a temperature not exceeding 90 C. After drying, it is treated with turpentine or alcohol at a temperature of about 60 C. in order to extract the resins and various other impurities therefrom. The purified lignin is treated with a mixture of three parts by volume of sulphuric acid and one part of hydrochloric acid at an elevated temperature below 100 C. and thereafter with concentrated sulphuric acid, of at least 62 B. at a substantially higher temperature, which according to the present invention is 220 C. rather than 200 C. as specified in the prior application. The carbon formed by" the action of the acid on the lignin is treated with hydrochloric acid at normal temperature, washed with distilled water, and dried at normal temperature.

It is desirable in some applications of the filter material that the carbon should possess sufl'icient strength to retain a porous structure.

It is advisable to wash the carbon with an alkaline solution before treating it with steam.

The proportions of the various carcinogenic substances in tobacco smoke vary with different kinds of tobacco and for 'each' tobacco the most suitable kind, and amount, of cellulosic material should be chosen. In general the cellulose should be chiefly alpha cellulose with a lessers amount of beta cellulose.

The filter material according to the invention can be incorporated in filters in various ways. The carbon, in finely divided form, may he intimately associated with cellulose wool or paper, or with tobacco itself, or the cellulosic material may take the form of a pair of plugs of cellulose wool or paper one at either end of a tubular support between which plugs the carbon is situated.

Filters in accordance with the invention can be provided on individual cigarettes or cigars as tips, or they may be provided in cigaror cigarette-holders or in tobacco pipes. In the latter case the filters may be in the form of throw-away filter elements: the cigaror cigarette-holders may also be of throw-away paper type. Filters provided in individual cigarettes or cigars should be of a length sufficient to absorb all or most of the carcinogenic substances produced on burning the cigarette or cigar.

I claim:

1. 'Filter material for use in filtering tobacco smoke comprising cellulosic material to effect mechanical filtering of the smoke, and carbon in combination therewith, in a form penetrable by smoke and of at least 96% purity, the carbon being obtained by a wet process from lignin produced in the manufacture of paper by the soda process and heated with concentrated sulphuric acid at a temperatureof over 220 C. the carbon being treated subsequently with steam.

2. Filter material as claimed in claim 1, wherein the carbon is of at least 99% purity.

3. Filter material as claimed in claim 1, wherein the carbon is intimately associated with cellulose wool.

4. Filter material as claimed in claim 1, wherein the carbon is intimately associated with paper.

5. Filter material as claimed in claim 1, wherein the cellulosic material is tobacco and the carbon is intimately associated therewith.

6. Filter material as claimed in claim 1, wherein in production of said carbon, the lignin is heated for five to six hours.

7. A cigarette having a filter tip comprising cellulosic material to effect mechanical filtering of the smoke, and carbon in finely divided form, the carbon 'being intimately associated with the cellulosic material and being obtained by a wet process from lignin produced in the manufacture of paper by the soda process and heated with concentrated sulphuric acid at a temperature of over 220 C. the carbon being treated subsequently with steam.

8. For a tobacco-smoking device including a tube for smoke from the tobacco and means for removably locating a filter in the path of smoke passing through said tube, a throw-away filter comprising cellulosic material to effect mechanical filtering of the smoke, and carbon in combination therewith, in a form penetrable by smoke and of at least 96% purity, the carbon being obtained by a wet process from lignin produced in the manufacture of paper by the soda process and heated with concenice References Cited in'the' file ,of-this patent UNITED STATES ,PATENTS 729,680 -Swartz... June'2,'1903 4 Bradford Oct. 5, 1909 Broadway .."July 19, 1932 Sadtler Dec. 25, 1934 Donnelly Apr. 10, 1945 FOREIGN PATENTS Great'Britain Oct. 30, 1930 Great Britain July 27, 1933 Great Britain Dec. 19, 1938

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US729680 *Aug 7, 1901Jun 2, 1903Wilhelm SchwartzNicotin-absorber.
US936083 *Oct 5, 1909Thaddeus Bogle BradfordPipe.
US1868469 *Apr 19, 1930Jul 19, 1932Hurshel H BroadwaySmoking apparatus
US1985840 *Nov 26, 1927Dec 25, 1934Samuel S SadtlerSmoking tobacco
US2373296 *Aug 25, 1943Apr 10, 1945Donnelly James ASmoking pipe and method of making same
GB337200A * Title not available
GB395918A * Title not available
GB497708A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3006346 *Dec 15, 1958Oct 31, 1961Edwin I GoldingFilters for cigarettes and cigars and method of manufacturing same
US3068873 *Nov 24, 1958Dec 18, 1962Celanese CorpFilters
US3251365 *Mar 4, 1963May 17, 1966Jr William W BatesTobacco smoke filter
US3279476 *Apr 16, 1964Oct 18, 1966Beatrice Foods CoCigarette filter
US3327715 *Oct 2, 1964Jun 27, 1967Gen Aniline & Film CorpTobacco smoke filter
US3355317 *Mar 18, 1966Nov 28, 1967Liggett & Myers Tobacco CoProcess of impregnating adsorbent materials with metal oxides
US4889143 *May 14, 1986Dec 26, 1989R. J. Reynolds Tobacco CompanyCigarette rods and filters containing strands provided from sheet-like materials
US4924887 *Feb 3, 1986May 15, 1990R. J. Reynolds Tobacco CompanyTobacco rods and filters
US7237558Sep 30, 2003Jul 3, 2007R. J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US7240678Sep 30, 2003Jul 10, 2007R. J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US7669604Mar 2, 2010R.J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US7827997Nov 9, 2010R. J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US7856990Sep 30, 2003Dec 28, 2010R. J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US8066011Sep 30, 2003Nov 29, 2011R. J. Reynolds Tobacco CompanyFiltered cigarette incorporating an adsorbent material
US8739802Oct 2, 2006Jun 3, 2014R.J. Reynolds Tobacco CompanyFiltered cigarette
US20050066980 *Sep 30, 2003Mar 31, 2005Crooks Evon LlewellynFiltered cigarette incorporating an adsorbent material
US20050066981 *Sep 30, 2003Mar 31, 2005Crooks Evon LlewellynFiltered cigarette incorporating an adsorbent material
US20050066982 *Sep 30, 2003Mar 31, 2005Clark Melissa AnnFiltered cigarette incorporating an adsorbent material
US20050066983 *Sep 30, 2003Mar 31, 2005Clark Melissa AnnFiltered cigarette incorporating an adsorbent material
US20050066984 *Sep 30, 2003Mar 31, 2005Crooks Evon LlewellynFiltered cigarette incorporating an adsorbent material
US20070056600 *Sep 14, 2005Mar 15, 2007R. J. Reynolds Tobacco CompanyFiltered smoking article
Classifications
U.S. Classification131/342
International ClassificationA24D3/16, A24D3/00
Cooperative ClassificationA24D3/163
European ClassificationA24D3/16B