High speed positive-working photothermographic radiographic film
US7214464B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2004 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Apr 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/43
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is directed to a method of forming a positive image in a photothermographic assembly comprising a photothermographic material and an intensifying means for converting ionizing radiation, wherein the assembly has been imagewise exposed to ionizing radiation to form a latent image in the photothermographic material. The photothermographic material has at least one imaging layer comprising a potentially negative-working emulsion, wherein thermal development of unexposed silver salts in exposed areas relative to unexposed areas is inhibiting when thermally developing the imagewise exposed assembly, thereby producing a positive image. The present invention is also directed to a photothermographic assembly that can be used in the present process in which a positive image characterized by high speed and discrimination is formed when exposed and thermally heated above 150° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.