Photographic darkroom control system with timing means
US4364655A · kind A · utility
Inventor
Key dates
| Filing date | Feb 19, 1981 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | Feb 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D13/007
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Process timing and controlling system for use in photographic darkrooms involving multiple timing and control process steps including a control console, programmable in at least one channel to step through substantially all timing and control process steps, timing means in at least one channel for measuring time remaining in a particular process step, timing indicator means in at least one channel for indicating time remaining in a particular process step, a source of power connecting the console and the timing means which when activated supplies power to the console and timing mean, means for initiating a program step in at least one channel, switching means in at least one channel for stepping through the steps independently of the programmed time, a plurality of relays for operating programmed timing and control functions, and relay driving means programmed to select an appropriate output to activate the relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.