Reusable bingo card
US4877253A · kind A · utility
41Cited by
10References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1987 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Feb 6, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A reusable bingo card comprising an exposed microporous layer having bingo numbers permanently imprinted thereon, and a liquid impervious support sheet bonded to the exposed layer. The support sheet is substantially darker than the background area of the exposed layer. To mark a number on the card a colorless volatile liquid is applied to the exposed layer making the applied area transparent and exposing the support sheet below producing a contrasting indicia that is darker than the background area but lighter than the numbers. Evaporation of the marking liquid restores the bingo card to its original appearance for reuse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.