Writing board
US5957700A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jun 2, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 2, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L21/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Writing boards such as electric blackboards which can erase all information written thereon without wiping the board by hand. On a front surface of an endless recording medium provided in the electric black board letters, characters, etc. are written with a writing tool. The writing tool uses an ink which is easily erasable with a cleaning liquid stored in a container. At the back surface of the recording medium, there is provided a cleaning instrument which faces the back surface of the recording medium. When all the writing is to be erased, an erasing switch is pushed. A pump is operated to move the recording medium, relative to the cleaning instrument. Thus, the cleaning liquid stored in the container circulates through tubes and the cleaning instrument and squeezes the cleaning liquid through an opening of the cleaning instrument to the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.