Pressure-sensitive copying material
US5476829A · kind A · utility
5Cited by
27References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Jul 1, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/155
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Pressure-sensitive copying material utilizes a blend of rapid- and slow-developing chromogenic materials in vegetable oil solvent and an acid clay or synthetic inorganic color developer. The surface pH of the color developer is not more than 8.7, which gives rise to enhanced image intensity and fade resistance compared with the use of conventional higher color developer surface pH values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.