子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | Step-shaped tab for locking together overlapping panels of cardboard devices | US998202 | 1997-12-24 | US5873517A | 1999-02-23 | Alfred F. Lisbon |
| Devices cut from cardboard, and preferably corrugated cardboard, are provided with a step-shaped tab at the end of one panel, preferably with only two steps, and a cutout in the end of another overlapped panel with a cutout corresponding to the shape and orientation of the step-shaped tab. A slit even with the second step of the cutout is made with a length of greater extent than the length of the wider first step of the tab such that the slit extends beyond the second step on each side by an extent equal to about twice the width of the first step of the tab, whereby inserting the tab into the slit is facilitated by the second step of the tab in cooperation with the step-shaped cutout, and the tab is locked in the slit by its extended ends pressing on the edges of the first step of the two-step tab. | ||||||
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