Siemens Aktiengesellschaft

Peter Graf

Joachim W Baumann

Hans Eschler

Horst Kiemle

Gerd Goldmann

Wolfgang Fink

By Irmela Bismarck, Heir

Ulrich V Hundelshausen, Deceased

Manfred Lang

By Burkhard Hundelshausen, Heir

An apparatus for measuring the thickness of a tubular plastic layer during the process of its fabrication, which includes an ultrasonic transducer which generates a signal dependent on the thickness of the shape being measured while the shape is at a non-uniform condition of temperature, and circuitry for generating at least one signal from known process parameters, and an arithmetic unit for processing the signals derived as described above to generate an error signal which compensates for the influence of temperature on the test.

Temperature-compensated ultrasonic measurement of wall thickness

A non-mechanical printer for use in an electrographic process comprising a drum-shaped data carrier, a recording head and a gas bearing for supporting the recording head on a cushion of gas in spaced relation to the data carrier. The data carrier is drum-shaped and the surfaces of the gas bearing which face the data carrier are correspondingly curved. The gas bearing includes porous walls for issuing pressurized gas toward the surface of the data carrier to produce the gas cushion.

Non-mechanical printer operating in accordance with an electrographic

Apparatus and method for holographic storage of data utilizing a light source and a number of light deflectors such that a single beam can be used to read data from a number of different holograms simultaneously.

Apparatus and method for holographic storage of data

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Munich, Germany

Peter Graf