发明名称 |
Luminescent backing sheet for writing in the dark |
摘要 |
A lined phosphorescent backing sheet for use in underlying relation with writing paper or drawing sheets permitting a writer to write in orderly form in the dark without need for external light.
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申请公布号 |
US4035652(A) |
申请公布日期 |
1977.07.12 |
申请号 |
US19760697924 |
申请日期 |
1976.06.21 |
申请人 |
SCHROEDER, BECKY J. |
发明人 |
SCHROEDER, BECKY J. |
分类号 |
F21K2/00;(IPC1-7):H01J1/62 |
主分类号 |
F21K2/00 |
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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