Hot melt ink projection transparency
US4873134A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Aug 10, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31801
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In the particular embodiments of the invention described in the specification, a projection transparency includes a transparent substrate and an ink pattern disposed on one surface of the transparent sheet in the form of three-dimensional ink spots having curved surfaces with a radius of curvature of at least 3 mils and an angle of contact with the substrate of no more than about 25.degree.. The transparency is prepared by applying ink drops to the substrate and maintaining the ink at a temperature above its melting point for a selected time such as 0.5 to 10 seconds. Thereafter, the ink is cooled rapidly to reduce crystallization and frosting and thereby reduce light transmission losses in the ink to less than 50%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.