| 发明名称 |
APPARATUS FOR INDICATING HOW DIRTY AN AIR FILTER IS IN A VACUUM-CLEANING APPARATUS, IN A ROOM FILTER, ETC. |
| 摘要 |
An apparatus is provided for indicating how dirty an air filter is that is disposed in an air stream for removing dirt therefrom. The apparatus includes an arrangement in the form of a light unit for measuring how dirty the air filter is. The apparatus also includes an indicator that is connected to the light unit. |
| 申请公布号 |
CA2041829(A1) |
申请公布日期 |
1991.11.06 |
| 申请号 |
CA19912041829 |
申请日期 |
1991.05.03 |
| 申请人 |
FIRMA FEDAG |
发明人 |
WORWAG, PETER |
| 分类号 |
B01D46/42;A47L9/19;A47L9/28;G01N21/55;G01N21/59 |
主分类号 |
B01D46/42 |
| 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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