发明名称 |
Protection device for transparencies for overhead projectors |
摘要 |
A transparency protection device for protecting a transparency sheet, the protection device including a protective sheet and a presentation flap generally coupled to the protective sheet. The protective sheet includes a generally transparent film having a first major surface and a second major surface, the first surface positioned to be in contact with the transparency sheet. At least a portion of the first major surface includes a plurality of integral micromounds protruding from the major surface. The protective sheet is micro-textured bi-axially oriented polypropylene having a micromound density in the range of 100 to 300 micromounds per square millimeter, the micromounds have a major axis length of 20 to 60 microns.
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申请公布号 |
US6375331(B1) |
申请公布日期 |
2002.04.23 |
申请号 |
US19990380454 |
申请日期 |
1999.09.02 |
申请人 |
3M INNOVATIVE PROPERTIES COMPANY |
发明人 |
LANDRIANI LAURA;GIACOBONE GIUSEPPE;CAPEZZUTO CONCETTA |
分类号 |
G03B21/132;G03B21/64;(IPC1-7):G03B21/14 |
主分类号 |
G03B21/132 |
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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