# US 8,464,726 B2 · Segmented smoking article with insulation mat > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,726 B2 - Document ID: US8464726B2 - Status: Granted - Kind: B2 - Application number: 12/546,107 - Filed: 2009-08-24 - Published: 2011-02-24 - Granted: 2013-06-18 - Earliest claimed: 2009-08-24 - Assignees: R.J. Reynolds Tobacco Company - Applicants: Andries Don Sebastian; Billy Tyrone Conner; Chandra K. Banerjee; Steven L. Alderman; Paul E. Braxton; Carolyn R Carpenter; Alvaro Gonzalez-Parra; Bradley J. Ingebrethsen; Kristen L. Murray; Timothy B. Nestor; Evon Llewellyn Crooks - Inventors: Andries Don Sebastian; Billy Tyrone Conner; Chandra K. Banerjee; Steven L. Alderman; Paul E. Braxton; Carolyn R Carpenter; Alvaro Gonzalez-Parra; Bradley J. Ingebrethsen; Kristen L. Murray; Timothy B. Nestor; Evon Llewellyn Crooks - Web page: https://patentgrep.com/patent/US8464726B2 ## CPC - A24D 1/22: Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources - A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES ## Abstract A cigarette includes lighting and mouth ends. It may include a smokable segment disposed at the lighting end. It also includes a mouth-end segment; an aerosol-generation system disposed between the lighting and mouth ends, which includes (i) a heat-generation segment adjacent the smokable segment, including a heat source configured to be activated by combustion of a smokable material and an insulation layer of a non-glass material that is woven, knit, or both, and (ii) an aerosol-generating segment with aerosol-forming material disposed between, but physically separate from, each of the heat generation segment and the mouth end; a piece of outer wrapping material that provides an overwrap around at least a portion of the aerosol-generating segment, the heat-generation segment, and at least a portion of the smokable segment; those segments being connected together by the overwrap to provide a cigarette rod; that is connected to the cigarette rod using tipping material. ## Claims ### Claim 1 A cigarette comprising: a lighting end and a mouth end; a smokable segment disposed at the lighting end, said smokable segment having a length and comprising a smokable material circumscribed by wrapping material; a mouth end piece segment disposed at the mouth end; an aerosol-generation system disposed between the smokable segment and the mouth end piece segment, the aerosol-generation system including (i) a heat generation segment adjacent to the smokable segment, said heat generation segment having a length and including a heat source configured to be activated by combustion of the smokable material and an insulation Layer of flame-retardant material that comprises non-glass viscose rayon material that is woven, knit or a combination thereof, and . . . (ii) an aerosol-generating segment incorporating aerosol-forming material, said aerosol-generating segment having a length and being disposed between, but physically separate from, each of the heat generation segment and the mouth end; a piece of outer wrapping material oriented to provide an overwrap (i) around the aerosol-generating segment for at least a portion of its length, (ii) around the heat generation segment for the length of that segment, and (iii) around the smokable segment for at least a portion of its length; those segments being connected together by the overwrap to provide a cigarette rod; and the mouth end piece segment being connected to the cigarette rod using tipping material. ### Claim 2 (depends on 1) The cigarette of claim 1, wherein the flame retardant material further comprises a material that is selected from, stainless steel fibers . . . or any combination thereof. ### Claim 3 (depends on 1) The cigarette of claim 1, wherein the heat generation segment and the aerosol-generating segment are in a heat exchange relationship with one another and the insulation provides an insulative layer about at least a portion of the heat source. ### Claim 4 (depends on 1) The cigarette of claim 1, wherein the insulation layer comprises a woven layer of a non-glass material. ### Claim 5 (depends on 1) The cigarette of claim 1, wherein the insulation layer further comprises carbon fibers containing at least 95% carbon. ### Claim 6 (depends on 1) The cigarette of claim 1, further comprising a buffer between the heat generation segment and the aerosol-generating segment, wherein the buffer further comprises a structure selected from a group consisting of: open air space; non-glass material that is woven, knit, or a combination thereof; a foamed metal material; a foamed ceramic material; a foamed ceramic metal composite; and any combination thereof. ### Claim 7 (depends on 1) The cigarette of claim 1, wherein the insulation layer further comprises rayon fibers treated with silica. ### Claim 8 (depends on 1) The cigarette of claim 1, wherein the insulation layer further comprises cellulose fibers. ### Claim 9 (depends on 1) The cigarette of claim 1, wherein the insulation layer comprises a woven-knit hybrid material. ### Claim 10 (depends on 1) The cigarette of claim 1, wherein the insulation layer further comprises a selected one of metalized fibers, metallic fibers, or a combination thereof. ### Claim 11 (depends on 1) The cigarette of claim 1, wherein the heat source comprises a foamed structure comprising carbon. ### Claim 12 A cigarette comprising: a lighting end and a mouth end; a mouth end piece segment disposed at the mouth end; an aerosol-generation system disposed near the lighting end, the aerosol-generation system including (i) heat generation segment having a length . . . and including a heat source configured to be activated by combustion of the smokable material and an insulation layer of flame-retardant material that comprises a material selected from a group consisting of: non-glass viscose rayon material that is woven, knit, or a combination thereof; a foamed metal material; a foamed ceramic material; and a foamed ceramic metal composite, and (ii) an aerosol-generating segment incorporating aerosol-forming material, said aerosol-generating segment having a length and being disposed between, but physically separate from, each of the heat generation segment and the mouth end; and a single piece of outer wrapping material oriented to provide an overwrap (i) around the mouth end piece segment for the length of that segment, (ii) around the aerosol-generating segment for the length of that segment, and (iii) around the heat generation segment for at least a portion of its length. ### Claim 13 (depends on 12) The cigarette of claim 12, wherein the length of the heat generation segment is less than about 30 mm, and the heat source comprises a carbonaceous fuel element. ### Claim 14 (depends on 12) The cigarette of claim 12, wherein the aerosol-generating segment comprises glycerin, propylene glycol or combinations thereof. ### Claim 15 (depends on 12) The cigarette of claim 12, wherein the heat generation segment and the aerosol-generating segment are in a heat exchange relationship with one another. ### Claim 16 (depends on 12) The cigarette of claim 12, wherein the insulation layer further comprises carbon fibers containing at least 95% carbon. ### Claim 17 (depends on 12) The cigarette of claim 12, further comprising a buffer between the heat generation segment and the aerosol-generating segment, wherein the buffer comprises a structure selected from a group consisting of: open air space; non-glass material that is woven, knit, or a combination thereof; a foamed metal material; a foamed ceramic material; a foamed ceramic metal composite; and any combination thereof. ### Claim 18 (depends on 12) The cigarette of claim 12, wherein the insulation layer further comprises rayon fibers treated with silica. ### Claim 19 (depends on 12) The cigarette of claim 12, wherein the insulation layer further comprises cellulose fibers. ### Claim 20 (depends on 12) The cigarette of claim 12, wherein the insulation layer comprises a woven-knit hybrid material. ### Claim 21 (depends on 12) The cigarette of claim 12, wherein the insulation layer further comprises a selected one of metalized fibers, metallic fibers, or a combination thereof. ### Claim 22 (depends on 12) The cigarette of claim 12, wherein the heat source comprises a foamed structure comprising carbon. ### Claim 23 (depends on 12) The cigarette of claim 12, wherein the aerosol-generating segment includes tobacco.