US3417758A - Filter elements and additives therefor - Google Patents
Filter elements and additives therefor Download PDFInfo
- Publication number
- US3417758A US3417758A US425920A US42592065A US3417758A US 3417758 A US3417758 A US 3417758A US 425920 A US425920 A US 425920A US 42592065 A US42592065 A US 42592065A US 3417758 A US3417758 A US 3417758A
- Authority
- US
- United States
- Prior art keywords
- tow
- filter
- filter elements
- hydrogen cyanide
- tobacco smoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000654 additive Substances 0.000 title description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 22
- 239000000779 smoke Substances 0.000 description 12
- 241000208125 Nicotiana Species 0.000 description 11
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 11
- 229910017053 inorganic salt Inorganic materials 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 229920002301 cellulose acetate Polymers 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005819 Potassium phosphonate Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- YXXXKCDYKKSZHL-UHFFFAOYSA-M dipotassium;dioxido(oxo)phosphanium Chemical compound [K+].[K+].[O-][P+]([O-])=O YXXXKCDYKKSZHL-UHFFFAOYSA-M 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 2
- NCPXQVVMIXIKTN-UHFFFAOYSA-N trisodium;phosphite Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])[O-] NCPXQVVMIXIKTN-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013773 glyceryl triacetate Nutrition 0.000 description 1
- 239000001087 glyceryl triacetate Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical class [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000011160 magnesium carbonates Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
Definitions
- This invention relates to filters that will remove hydrogen cyanide from smoke. More particularly it relates to filter elements containing additives which will effectively neutralize the hydrogen cyanide normally encountered in tobacco smoke.
- One object of this invention is to provide a filter element that will remove a considerable amount of hydrogen cyanide from the vapor portion of tobacco smoke. Another object is to provide a method of increasing the filtration efficiency of tobacco smoke filter elements. Further objects will appear hereinafter.
- our invention involves applying to a filter tow such as acetate tow a water-soluble inorganic salt of a Group Ia element.
- Preferred salts are the carbonates, and phosphites of sodium and potassium.
- the salts are preferably finely divided. The preferred particle size is such that the particles will pass through a 100-mesh screen (U.S. S. Sieve).
- the water-soluble inorganic salt may be applied by sifting, dusting, shaking, or from a water solution or plasticizer dispersion. It may also be applied by spraying or rolling on the tow. More than one salt may be used as a mixture if desired.
- a preferred tow on which the additives of this invention may be used is crimped continuous filament cellulose acetate tow, preferably of a denier per filament of about 1.6 to 10.
- the water-soluble inorganic salt may be applied to the tow in the amount of from 1 to 30% by weight, the preferred amount being 2 to by weight of the filter element prepared from the tow to which additive is applied.
- the crimped tow is spread out to a width of 10-20 inches or so and a plasticizer for the tow, containing 10 to 50% by weight of the water-soluble inorganic salt dispersed therein, applied by padding the tow with rollers.
- the tow is then compacted, wrapped with paper to form a rod, and allowed to stand until firm.
- Addition of the plasticizer dispersion helps add rigidity to the resulting rod and leaves the salt evenly distributed on the surface of the tow. After the rod becomes firm, it may be cut into any desired length and used either alone as a filter or in combination with other filters to make a dual or multiple filter.
- Example I A 170-mm. portion of 3 denier/ filament crimped cellulose acetate filter tow which had 20,000 filaments and Weighed approximately 1 gram was spread out to a width of 15 inches. A blend of 30 parts diethylene glycol, 60 parts triacetin, and 20 parts sodium carbonate (ZOO-meshv powder) was padded on the opened tow until mg. of the total mixture was added. The tow was then recompacted and wrapped with a paper tape to form a filter rod with a circumference of 25 mm. The rod was allowed to stand until firm and was then cut into 17-min. segments which contained approximately 2 mg. of sodium carbonate. The 17-min.
- a selective tobacco smoke filter element comprising a plurality of cellulose ester fibers and containing from 1 to 30% by weight of said element of a water soluble, weak base inorganic salt capable of chemically reacting with and selectively rendering harmless hydrogen cyanide vapors contained in the tobacco smoke passing through the filter element, the water soluble inorganic salt being selected from the group consisting of sodium phosphite and potassium phosphite.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
- Paper (AREA)
Description
United States Patent C 3,417,758 FILTER ELEMENTS AND ADDITIVES THEREFOR Cephas H. Sloan and Bobby J. Sublett, Kingsport, Tenn, assignors to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey No Drawing. Filed Jan. 15, 1965, Ser. No. 425,920 2 laims. (Cl. 131-266) ABSTRACT OF THE DISCLOSURE A selective tobacco smoke filter element containing a water-soluble, weak basic inorganic salt which is capable of chemically reacting with and rendering harmless substantially all hydrogen cyanide vapors contained in the tobacco smoke passing through the filter elements. The organic salt is selected from the group consisting of sodium phosphite and potassium phosphite.
This invention relates to filters that will remove hydrogen cyanide from smoke. More particularly it relates to filter elements containing additives which will effectively neutralize the hydrogen cyanide normally encountered in tobacco smoke.
In US. Patent 2,940,456 our co-worker Touey disclosed use of calcium and magnesium carbonates to remove particulate matter commonly referred to as tars. Since issuance of said patent a need has developed for removal from tobacco smoke of certain other substances not removable by said carbonates. Such substances include hydrogen cyanide. After extended investigation we have found a group of additives that will remove hydrogen cyanide from tobacco smoke when applied to the tow of tobacco smoke filters.
One object of this invention is to provide a filter element that will remove a considerable amount of hydrogen cyanide from the vapor portion of tobacco smoke. Another object is to provide a method of increasing the filtration efficiency of tobacco smoke filter elements. Further objects will appear hereinafter.
In its broader aspects our invention involves applying to a filter tow such as acetate tow a water-soluble inorganic salt of a Group Ia element. Preferred salts are the carbonates, and phosphites of sodium and potassium. The salts are preferably finely divided. The preferred particle size is such that the particles will pass through a 100-mesh screen (U.S. S. Sieve). The water-soluble inorganic salt may be applied by sifting, dusting, shaking, or from a water solution or plasticizer dispersion. It may also be applied by spraying or rolling on the tow. More than one salt may be used as a mixture if desired.
A preferred tow on which the additives of this invention may be used is crimped continuous filament cellulose acetate tow, preferably of a denier per filament of about 1.6 to 10.
The water-soluble inorganic salt may be applied to the tow in the amount of from 1 to 30% by weight, the preferred amount being 2 to by weight of the filter element prepared from the tow to which additive is applied. By uniform application to the surface of the tow the salt is enabled to take advantage of the large surface area which provides the contact necessary for hydrogen cyanide removal by neutralization.
According to one embodiment of our invention the crimped tow is spread out to a width of 10-20 inches or so and a plasticizer for the tow, containing 10 to 50% by weight of the water-soluble inorganic salt dispersed therein, applied by padding the tow with rollers. The tow is then compacted, wrapped with paper to form a rod, and allowed to stand until firm. Addition of the plasticizer dispersion helps add rigidity to the resulting rod and leaves the salt evenly distributed on the surface of the tow. After the rod becomes firm, it may be cut into any desired length and used either alone as a filter or in combination with other filters to make a dual or multiple filter.
The following example is illustrative of our invention.
Example I A 170-mm. portion of 3 denier/ filament crimped cellulose acetate filter tow which had 20,000 filaments and Weighed approximately 1 gram was spread out to a width of 15 inches. A blend of 30 parts diethylene glycol, 60 parts triacetin, and 20 parts sodium carbonate (ZOO-meshv powder) was padded on the opened tow until mg. of the total mixture was added. The tow was then recompacted and wrapped with a paper tape to form a filter rod with a circumference of 25 mm. The rod was allowed to stand until firm and was then cut into 17-min. segments which contained approximately 2 mg. of sodium carbonate. The 17-min. segments were attached to a kingsize cigarette by means of a cellophane tape, and the cigarette smoked on an automatic smoking device. The vapors which passed through the filter were collected and analyzed for hydrogen cyanide by a spectrophotometric method. The vapors from a king-size cigarette which did not have a filter were collected, analyzed in the same manner, and the two analyses were compared. The cigarette without filter delivered 138 ,ug. of hydrogen cyanide, and the cigarette containing the treated cellulose acetate filter delivered only 23 g. of hydrogen cyanide.
We claim:
1. A selective tobacco smoke filter element comprising a plurality of cellulose ester fibers and containing from 1 to 30% by weight of said element of a water soluble, weak base inorganic salt capable of chemically reacting with and selectively rendering harmless hydrogen cyanide vapors contained in the tobacco smoke passing through the filter element, the water soluble inorganic salt being selected from the group consisting of sodium phosphite and potassium phosphite.
2. A selective tobacco smoke filter element according to claim 1 wherein said salt is present in an amount of from 2 to 10% by weight of said element.
References Cited UNITED STATES PATENTS 2,832,351 4/1958 Hale 131-266 X 3,368,566 2/1968 Avedikian 131-265 X 3,320,961 5/1967 Hughes et al. v 131-267 2,172,946 9/ 1939 Sutter 131-265 3,101,723 8/1963 Seligrnan et a1. 131-269 X FOREIGN PATENTS 86,246 11/ 1921 Austria. 760,772 11/ 1956 Great Britain.
908,185 10/ 1962 GreatBritain.
SAMUEL KOREN, Primary Examiner.
DENNIS I. DONOHUE, Assistant Examiner.
US. Cl. X.R.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US425920A US3417758A (en) | 1965-01-15 | 1965-01-15 | Filter elements and additives therefor |
| US462050A US3403689A (en) | 1965-01-15 | 1965-06-07 | Paper filter of selective removal of a cigarette smoke vapor |
| BE674968D BE674968A (en) | 1965-01-15 | 1966-01-11 | |
| FR45597A FR1465842A (en) | 1965-01-15 | 1966-01-12 | Tobacco smoke filters retaining hydrocyanic acid |
| GB1803/66A GB1085582A (en) | 1965-01-15 | 1966-01-14 | Tobacco smoke filters and materials therefor |
| ES0321774A ES321774A1 (en) | 1965-01-15 | 1966-01-14 | Improvements introduced in the manufacture of a fibrous product, for filters of cigarettes. (Machine-translation by Google Translate, not legally binding) |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US425920A US3417758A (en) | 1965-01-15 | 1965-01-15 | Filter elements and additives therefor |
| US462050A US3403689A (en) | 1965-01-15 | 1965-06-07 | Paper filter of selective removal of a cigarette smoke vapor |
| US476660A US3397705A (en) | 1965-08-02 | 1965-08-02 | Filter elements and additive containing material therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3417758A true US3417758A (en) | 1968-12-24 |
Family
ID=27411494
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US425920A Expired - Lifetime US3417758A (en) | 1965-01-15 | 1965-01-15 | Filter elements and additives therefor |
| US462050A Expired - Lifetime US3403689A (en) | 1965-01-15 | 1965-06-07 | Paper filter of selective removal of a cigarette smoke vapor |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US462050A Expired - Lifetime US3403689A (en) | 1965-01-15 | 1965-06-07 | Paper filter of selective removal of a cigarette smoke vapor |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US3417758A (en) |
| BE (1) | BE674968A (en) |
| ES (1) | ES321774A1 (en) |
| FR (1) | FR1465842A (en) |
| GB (1) | GB1085582A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990003125A1 (en) * | 1988-09-28 | 1990-04-05 | Eastman Kodak Company | Tobacco smoke filters and process for production thereof |
| US5150723A (en) * | 1988-09-28 | 1992-09-29 | Eastman Kodak Company | Process for the production of tobacco smoke filters |
| US5911224A (en) * | 1997-05-01 | 1999-06-15 | Filtrona International Limited | Biodegradable polyvinyl alcohol tobacco smoke filters, tobacco smoke products incorporating such filters, and methods and apparatus for making same |
| US20070056600A1 (en) * | 2005-09-14 | 2007-03-15 | R. J. Reynolds Tobacco Company | Filtered smoking article |
| CN105642240A (en) * | 2014-11-10 | 2016-06-08 | 南通醋酸纤维有限公司 | Porous cellulose diacetate adsorbent, and preparation method and application thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4763674A (en) * | 1986-04-16 | 1988-08-16 | Hercules Incorporated | Method and device for controlling hydrogen cyanide and nitric oxide concentrations in cigarette smoke |
| US5141006A (en) * | 1990-02-28 | 1992-08-25 | Eastman Kodak Company | Tobacco smoke filter material and process for production thereof |
| US5150721A (en) * | 1990-02-28 | 1992-09-29 | Lee Benedict M | Tobacco smoke filter material and process for production thereof |
| US9491971B2 (en) * | 2005-12-13 | 2016-11-15 | Philip Morris Usa Inc. | Specifically-defined smoking article with activated carbon sorbent and sodium bicarbonate-treated fibers and method of treating mainstream smoke |
| ITVA20060056A1 (en) * | 2006-09-06 | 2008-03-07 | Giuseppe Elia | FILTER TO REMOVE TOXIC TOBACCO SMOKE SUBSTANCES |
| CN111557467B (en) * | 2020-05-13 | 2021-12-07 | 四川中烟工业有限责任公司 | Preparation method of cyan cigar wrapper tobacco leaves |
| CN112523003A (en) * | 2020-12-03 | 2021-03-19 | 中国制浆造纸研究院有限公司 | Preparation method of hard groove paper for cigarette filter stick |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT86246B (en) * | 1919-02-20 | 1921-11-10 | Ella Schlesinger | Process for the manufacture of smoke cartridges. |
| US2172946A (en) * | 1935-09-04 | 1939-09-12 | Roser B Sutter | Tobacco smoke purifier |
| GB760772A (en) * | 1954-12-28 | 1956-11-07 | Frank Fessler | Improvements in cigarettes and cigars |
| US2832351A (en) * | 1950-06-26 | 1958-04-29 | Verdurin Company | Method of treating tobacco smoke |
| GB908185A (en) * | 1959-01-06 | 1962-10-17 | Lorillard Co P | Improvements in or relating to tobacco smoke filters |
| US3101723A (en) * | 1960-11-15 | 1963-08-27 | Philip Morris Inc | Fibrous cigarette filter |
| US3320961A (en) * | 1963-07-22 | 1967-05-23 | Brown & Williamson Tobacco Corp | Cigarette filters |
| US3368566A (en) * | 1964-06-17 | 1968-02-13 | Souren Z. Avediklan | Filter cigarette |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2768913A (en) * | 1954-10-22 | 1956-10-30 | Ohio Commw Eng Co | Cigarette filter tips from dextran |
| US3019764A (en) * | 1958-03-06 | 1962-02-06 | Schilling Electric Company | Milk releaser with timer control |
-
1965
- 1965-01-15 US US425920A patent/US3417758A/en not_active Expired - Lifetime
- 1965-06-07 US US462050A patent/US3403689A/en not_active Expired - Lifetime
-
1966
- 1966-01-11 BE BE674968D patent/BE674968A/xx unknown
- 1966-01-12 FR FR45597A patent/FR1465842A/en not_active Expired
- 1966-01-14 ES ES0321774A patent/ES321774A1/en not_active Expired
- 1966-01-14 GB GB1803/66A patent/GB1085582A/en not_active Expired
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT86246B (en) * | 1919-02-20 | 1921-11-10 | Ella Schlesinger | Process for the manufacture of smoke cartridges. |
| US2172946A (en) * | 1935-09-04 | 1939-09-12 | Roser B Sutter | Tobacco smoke purifier |
| US2832351A (en) * | 1950-06-26 | 1958-04-29 | Verdurin Company | Method of treating tobacco smoke |
| GB760772A (en) * | 1954-12-28 | 1956-11-07 | Frank Fessler | Improvements in cigarettes and cigars |
| GB908185A (en) * | 1959-01-06 | 1962-10-17 | Lorillard Co P | Improvements in or relating to tobacco smoke filters |
| US3101723A (en) * | 1960-11-15 | 1963-08-27 | Philip Morris Inc | Fibrous cigarette filter |
| US3320961A (en) * | 1963-07-22 | 1967-05-23 | Brown & Williamson Tobacco Corp | Cigarette filters |
| US3368566A (en) * | 1964-06-17 | 1968-02-13 | Souren Z. Avediklan | Filter cigarette |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990003125A1 (en) * | 1988-09-28 | 1990-04-05 | Eastman Kodak Company | Tobacco smoke filters and process for production thereof |
| EP0363288A1 (en) * | 1988-09-28 | 1990-04-11 | EASTMAN KODAK COMPANY (a New Jersey corporation) | Tobacco smoke filters and process for production thereof |
| US4964426A (en) * | 1988-09-28 | 1990-10-23 | Eastman Kodak Company | Tobacco smoke filters and process for production thereof |
| US5150723A (en) * | 1988-09-28 | 1992-09-29 | Eastman Kodak Company | Process for the production of tobacco smoke filters |
| US5911224A (en) * | 1997-05-01 | 1999-06-15 | Filtrona International Limited | Biodegradable polyvinyl alcohol tobacco smoke filters, tobacco smoke products incorporating such filters, and methods and apparatus for making same |
| US20070056600A1 (en) * | 2005-09-14 | 2007-03-15 | R. J. Reynolds Tobacco Company | Filtered smoking article |
| WO2007033272A1 (en) * | 2005-09-14 | 2007-03-22 | R. J. Reynolds Tobacco Company | Filtered smoking article |
| CN105642240A (en) * | 2014-11-10 | 2016-06-08 | 南通醋酸纤维有限公司 | Porous cellulose diacetate adsorbent, and preparation method and application thereof |
| CN105642240B (en) * | 2014-11-10 | 2018-04-06 | 南通醋酸纤维有限公司 | A kind of porous cellulose diacetate adsorbent and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1085582A (en) | 1967-10-04 |
| ES321774A1 (en) | 1967-01-01 |
| FR1465842A (en) | 1967-01-13 |
| US3403689A (en) | 1968-10-01 |
| BE674968A (en) | 1966-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3349780A (en) | Acetate filter elements containing carbon | |
| US3417758A (en) | Filter elements and additives therefor | |
| DE3310092C2 (en) | Casing material for reducing sidestream smoke and process for its production | |
| RU2140758C1 (en) | Filter cigarette | |
| US3236244A (en) | Tobacco smoke filter element | |
| DE69115383T2 (en) | Smoking articles | |
| US3327718A (en) | Tobacco-smoke filters | |
| US3370595A (en) | Smoke filters | |
| BRPI0906555B1 (en) | tobacco smoke filter or filter element, filter cigarette, and multiple stick | |
| US3428056A (en) | Tobacco smoke filter incorporating coated polyolefin additive | |
| US3008472A (en) | Filament filter containing a hygroscopic compound | |
| US3664352A (en) | Tobacco smoke filter | |
| US3428055A (en) | Filter elements and additive therefor | |
| US3802441A (en) | Tobacco smoke filter additive | |
| US3724469A (en) | Tobacco smoke filter | |
| JP4824568B2 (en) | Cigarette smoke filter | |
| US3426763A (en) | Tobacco smoke filter having a coated carbon additive | |
| CA2023272C (en) | Smoking articles | |
| US3349779A (en) | Cigarette filter element containing certain hexahydrotriazines for the selective removal of acrolein | |
| US3608563A (en) | Cigarette filter | |
| US3498299A (en) | Filtration of tobacco smoke | |
| DE612737C (en) | Filter insert for cigars, cigarettes, smoke tips or the like. | |
| US3424168A (en) | Removing contaminants from cigarette smoke | |
| US3403690A (en) | Filters for tobacco smoke | |
| US3359990A (en) | Cigarette filter element containing water-soluble monomeric hydrazides for the selective removal of aldehyde vapors |