| 发明名称 |
METHOD OF MAKING POLYPROPYLENE ELECTRETS |
| 摘要 |
An electret which comprises a polypropylene film having a high volume resistivity and having been permanently electrically polarized.
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| 申请公布号 |
US3632443(A) |
申请公布日期 |
1972.01.04 |
| 申请号 |
USD3632443 |
申请日期 |
1969.04.18 |
| 申请人 |
SONY CORP. |
发明人 |
YOICHI KODERA;TOMOSABURO KITAMURA;ETSURO SAWAGUCHI |
| 分类号 |
H01G7/02;(IPC1-7):C23C13/00 |
主分类号 |
H01G7/02 |
| 代理机构 |
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代理人 |
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| 地址 |
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