Marker/anti-marker system
US3941488A · kind A · utility
94Cited by
2References
1Claims
0Family size
Inventor
Key dates
| Filing date | Jul 10, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Jul 10, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L19/0018
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A marker system that employs an erasing unit that can couple and uncouple readily from its marker to facilitate the use of specific chemical reagents to "erase" their associated indicator dye inks without the use of non-discriminating bleaches. This erasing unit or anti-marker marker can be mounted in the marker cap, alternately in the marker barrel or used as a separate erasing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.