Optical remote-control device for a residence door
US4561116A · kind A · utility
6Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1983 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Nov 22, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/60
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The device consists of an inspection glass (3) inserted in the door (1), a semi-transparent mirror (5) which is arranged inclined behind the inspection glass (3) and which faces the inspection glass (3) with the semi-reflecting side (6), and an optical receiver (7) which is located in the axis of reflection of the mirror (5). The invention is used in the building industry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.