Lactones of the diazaxanthene series, their production and their use as dye-forming components for copying methods
US3931182A · kind A · utility
3Cited by
0References
7Claims
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Assignee
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Key dates
| Filing date | Jul 31, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/1455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Lactones of the diazaxanthene series, their manufacture from a benzoylbenzoic acid and a pyrimidine, and their use as dye-forming components in the red range for pressure-sensitive recording material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.