Gould Inc.

Martin Marietta Corporation

William P Krug

Karl Minten

Henry F Gibbard

Mark W Beranek

Meredith A Aronson

Stephen D Darling

A piezoelectric composite material having increased sensitivity and stability with time is described. The composite includes a volume fraction of from 20 to 60 percent of piezoelectric crystals having a size distribution of from 1 to 300 microns dispersed in a polymer matrix. The composite matrix is characterized by a shear modulus of at least 50 psi.

Piezoelectric composite materials and method of making

The present invention relates to a novel method and apparatus which can provide continuous monitoring of the oxygen content of a gas over an indefinite period of time and at a minimal cost. In the novel apparatus of the present invention, a light source and a light sensitive detector are disposed within the atmosphere to be measured, and a polymeric film formed from a manganese tertiary phosphine polymer complex is deposited between the light source and the detector. As oxygen pressure increases or decreases a change in color intensity of the film takes place which controls passage of light from the light source to the detector. The detector in turn is suitably connected to an audio and/or visual warning device and/or a recorder which will provide the desired form of warning.

Oxygen monitoring device and method

Method and apparatus which can provide continuous monitoring of the partial pressure of one or more gases in an atmosphere or feed stream, over an indefinite period of time and at a minimal cost. The method and apparatus of the present invention operates by monitoring the change in frequency of a piezoelectric element which has been coated with a film formed from manganese tertiary phosphine polymer complex. As the polymer absorbs or releases gas the frequency of the piezoelectric device will be altered.

Gas monitoring device and method

The present invention relates to novel polymer compositions and the novel method of their synthesis. The novel polymer compositions are synthesized by forming a tetrahydrofuran solution of a polymer selected from the group consisting of polyvinylchloride, polystyrene, and silicone; adding an anhydrous manganese salt of the formula:

Manganese-tertiary phosphine-polymer complexes

An electrochemical system including a chlorine positive electrode, such as zinc-chlorine cell, is disclosed which complexes chlorine by utilizing (1) a selected organic compound, such as, for example, n-butyl carbamate, which includes a --NH.sub.n R.sub.2-n functionality wherein R is an appropriate organic moiety, and n is an integer, either 1 or 2, and an electron-withdrawing substituent alpha to the nitrogen and (2) a buffer to provide a liquid oil, which yields chlorine when required in discharge of the cell.

Growing community of inventors

Hoffman Estates, IL, United States of America

William P Krug