Other

Conductus, Inc.

Trebor Incorporated

Robert D Black

Vincent Y Kotsubo

In Nuclear Magnetic Resonance (NMR) spectroscopy and microscopy, noise from the receiver coil of the probe limits sensitivity. This noise may be reduced by cooling the receiver coil. Noise may be even further reduced by use of a superconducting receiver coil. However, high temperature superconductors must be maintained at temperatures significantly below the critical temperature, typically in the range of 10-60 K for proper performance. The invention provides an apparatus for cooling an NMR receiver coil to a desired temperature using a closed circuit refrigeration system. A cold fluid is circulated to a heat exchanger which is in thermal contact with a thermally conductive substrate having low magnetic susceptibility. The receiver coil is deposited on a portion of the substrate located distally from the heat exchanger. In the preferred embodiment, the substrate is sapphire and the receiver coil is a superconductive oxide. In one embodiment of the invention, the cold fluid is delivered through a cold-finger device, thus permitting easy access to the receiver coil while maintaining the closed circuit cooling.

Apparatus for cooling NMR coils

A safety backpack sprayer has a backpack frame onto which a replaceable premixed-spray container is positioned with convenient means. A spray-emission device is attachable to the backpack frame. A tubular conveyance is attachable conveniently intermediate the premixed-spray container and the spray-emission device. A tamper-proof cover or lid on the premixed-spray container prevents or deters putting unauthorized spray or spray components for mixture in the premixed-spray container. The premixed-spray container is structured for marketing distribution and optional refilling by government-authorized sources.

Backpack closed system sprayer

A resilient plug for sealing drilled holes in a solid surface to prevent the discharge from the hole of fluids or chemicals. The plug is of tubular shape and has a flat top surface and a tubular side wall from which a plurality of sealing ribs project to engage the side wall of a drilled hole. The ribs prevent the passage of fluids or chemicals from the hole.

Growing community of inventors

Douglasville, GA, United States of America

Robert D Black