Variable volume diazotype developing apparatus and method
US4288155A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1979 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Aug 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D7/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Diazotype developing apparatus and method in which a gaseous developing medium, such as a mixture of ammonia and air of predetermined concentration, is contained within a containing system, which includes the developing chamber of the apparatus, and the volume of the containing system is variable with only negligible changes in the pressure within the containing system so as to allow the volume of gaseous developing medium to be maintained within the containing system at essentially the same pressure as the pressure of the surrounding ambient atmosphere during variations in the volume of gaseous developing medium within the containing system resulting from operation of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.