Patent · US Expired

Device for rapid demonstration of the action of phototropic objects

US4505683A · kind A · utility

5Cited by

2References

6Claims

0Family size

Assignee

Carl Zeiss Stiftung · DE

Inventors

Hermann Schurle · Aalen, DE
Wolfgang Grimm · Bremen, DE
Hubert Bammert · Aalen, DE

Key dates

Filing date	May 5, 1983
Grant date	Mar 19, 1985
Priority date	—
Expiry date	May 5, 2003

Classification

Technology area (CPC G)Physics
CPC primaryG01M11/0285
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A device for rapidly demonstrating the darkening action of phototropic objects, particularly eyeglasses. The device has a housing or casing provided in its lower part (6) with a hollow space (7) which is placed over the objects to be demonstrated (8, 9) while such objects lie on any suitable horizontal supporting surface such as a table or desk. These objects are uniformly illuminated by a flash tube emitting light in the UV-A range and in the visible range. Upon each actuation of the circuit controlling the flash tube a plurality of flashes which succeed each other at a predetermined time interval is automatically given off.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.