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Audio Signal Processing

Calcium-aluminate-cement

Apparatus for determining the density of unoccupied electronic states of a material

The present invention relates to an apparatus which obviates these disadvantages and in particular ...

Device for reading a sensor matrix

I claim: 1. A device for reading charges of a plurality of radiation sensitive sensor elements ...

Package for push-pull semiconductor devices

OF THE INVENTION Referring now to FIG. 1 the transistor package is comprised of a ceramic wafer 10 ...

Ear receiver

In accordance with one aspect of the present invention an apparatus is provided for positioning a ...

Electrical connector

I claim: 1. A distributing station for an audio device whereby the signal coming from the audio ...

Method of making a telephone headset

OF THE BEST MODE OF THE INVENTION The headset of the present invention is shown in an overview in F...

Super directional beamforming design and implementation

The following description will be divided into four parts. Part one will detail a method for ...

Telephone transducer with improved frequency response

It is an object of this invention, therefore, to obtain maximum sound quality from a transducer ...

Driving control device for vibration wave motor

An object of the present invention is to restore ultrasonic motor which has gone into an vibration ...

Loudspeaker structure

According to the invention, a loudspeaker comprises a motor stator providing an air gap, a voice ...

Calcium aluminate cement

Details

Inventors: Masaryk, Joseph S.;
Assignee: Kaiser Aluminum & Chemical Corporation (Oakland, CA)
Primary Examiner: Poer; J.
Assistant Examiner:
Attorney, Agent or Firm: Calrow; Paul E., McQuarrie; Malcolm

A refractory cement is made by combining a clinker which is substantially all CaO.Al.sub.2 O.sub.3 (CA) with a roughly equal weight amount of an alumina which has been calcined to produce a carefully controlled morphology, particularly specific surface and pore size within relatively narrow ranges. Both materials are very finely divided, at least 80% passing a 325 mesh screen.

DETAILED DESCRIPTION It has now been found, according to this invention, that an improved refractory calcium aluminate cement can be made by admixing (a) from 40 to 60% by weight of a clinker at least 80% by weight of which is the CA phase with (b) from 60 to 40% by weight of an alumina which has a specific surface of from 1 to 30 m.
sup.
2 /g, an average pore size of from 0.
05 to 0.
5 microns, and a brain coral morphology; the clinker and the alumina having been ground, after admixing, so that 80% by weight passes a 325 mesh screen.

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