Pressure sensitive transfer sheet
US3963853A · kind A · utility
9Cited by
5References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1972 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Dec 27, 1992 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31812
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A coated transfer sheet for pressure-sensitive copying systems which comprises an organic colorless color former containing two or more potential chromophoric systems each of which is capable of being activated substantially immediately when the compound is brought into contact with one or more activating substances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.