Remote control slide projector module
US4747121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | May 1, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A slide projector control module and control system to operate one or more slide projectors located at one or more different locations, each slide projector having a slide tray and being connected with the control module. Conventional telephone lines are used to connect each slide projector and each module at each location for viewing the same slide at all locations. Slide projectors at all locations are capable of being rendered operative and the slide projector is operative only at its location with its associated control module when properly selected. Each module includes switches to connect and disconnect the remote and local projector from a key pad which provides touch tone signals capable of being muted from telephone lines. The control system is operable from a local or remote site to permit conferences to discuss a series of visuals and to recall the visuals as needed at each site of a multi-site and/or multi-person conference. The slide projector control module is provided at each site and is capable of operation as a master or a slave to permit each site to be a master or slave operable from a local or a remote site, so that the slide viewed at each site presents the sam…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.