发明名称 |
Tamper-resistant polyester credit cards |
摘要 |
The present invention relates to a credit card or identification card fabricated from amorphous polyester sheet material wherein at least the area of said card containing embossed numerical or letter characters and the characters themselves are composed of substantially crystalline polyester. Such characters can not readily be altered by either heat treatment or by shaving them off.
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申请公布号 |
US4557963(A) |
申请公布日期 |
1985.12.10 |
申请号 |
US19840678535 |
申请日期 |
1984.12.05 |
申请人 |
AMERICAN HOECHST CORPORATION |
发明人 |
CAINES, R. SCOTT |
分类号 |
B32B27/36;B32B38/04;B42D15/10;(IPC1-7):B32B3/00;B32B1/00;C09J5/00;B41M3/14 |
主分类号 |
B32B27/36 |
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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