Patent DE2723398A1 successfully refreshed from Google Patents.
DE2723398A1
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Sensor switch for lift - has recess whose depth direction is perpendicular to path between light emitting and light receiving components
Assignee: Thoma Aufzuege & Co Steue GmbH
•
Filing: 1977-05-24
•
Granted: —
•
Expires: 1997-05-24
Abstract
Abstract The sensor switch is esp. for lifts to select the floor or to call the lift. The switch has a recess (3) open towards the user. A light emitting component (5) and a light receiving component (6) are placed diametrically opposite to each other on the sides of the recess, so that light from the light emitter reaches the light receiver. The light barrier so produced is perpendicular to the direction of the recess depth. The switch may use infrared radiation. The recess may have a transparent wall around its periphery which covers the light components.
Inventors
- 👤 Alfred Thoma
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/941
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.