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Cigarette filter
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Patent number 4,582,072
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Issue date Apr 15, 1986
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Cigarette filter
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Patent number 4,438,776
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Issue date Mar 27, 1984
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Brown & Williamson Tobacco Corporation
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Charles G. Lamb
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Cigarette filter
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Patent number 4,406,295
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Issue date Sep 27, 1983
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Cigarette filter
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Patent number 4,342,322
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Issue date Aug 3, 1982
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Cigarette filter
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Patent number 4,338,956
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Issue date Jul 13, 1982
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Reinforcement of tobacco structure
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Patent number 4,034,766
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Issue date Jul 12, 1977
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES
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Reinforcement of tobacco structure
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Patent number 3,948,275
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Issue date Apr 6, 1976
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Brown & Williamson Tobacco Corporation
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Robert A. Sanford
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A24 - TOBACCO CIGARS CIGARETTES SMOKERS' REQUISITES