发明名称 |
Ventilated cigarette filter |
摘要 |
A cigarette filter comprising longitudinally aligned core components a first of which is air-permeable and of relatively high pressure drop longitudinally of the filter but substantially air-impermeable radially of the filter and a second of which is air-permeable and of relatively low pressure drop longitudinally of the filter, and a common wrap or partial wrap which extends along and around or partially around said core components and provides for ventilation of the filter at a region longitudinally spaced from the first core component.
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申请公布号 |
US4807647(A) |
申请公布日期 |
1989.02.28 |
申请号 |
US19860920301 |
申请日期 |
1986.10.17 |
申请人 |
CIGARETTE COMPONENTS LIMITED |
发明人 |
HAYES, ERNEST B. |
分类号 |
A24D1/04;A24D3/04;(IPC1-7):A24D3/02 |
主分类号 |
A24D1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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