Patent · US Expired

Underwater camera

US4153357A · kind A · utility

11Cited by

7References

10Claims

0Family size

Assignee

Preussag Aktiengesellschaft

Inventors

Helmut Winnacker
Jurgen Dierssen · Barsinghausen, DE

Key dates

Filing date	Sep 22, 1977
Grant date	May 8, 1979
Priority date	—
Expiry date	Sep 22, 1997

Classification

Technology area (CPC G)Physics
CPC primaryG03B17/38
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An underwater camera in a pressure tight housing and a release mechanism for releasing the shutter at a predetermined distance from the sea bed. The release mechanism includes a transducer on the housing exterior for transmitting ultrasonic signals and receiving echo signals and an electronic circuit on the interior of the housing for opening the shutter in response to the echo signals when the camera has reached the predetermined distance from the sea bed.

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