James Michael Hawk

US Patent:

54359724, Jul 25, 1995

Filed:

Dec 21, 1993

Appl. No.:

8/171270

Inventors:

C. Stuart Daw - Knoxville TN
James A. Hawk - Oak Ridge TN

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G05D 700

US Classification:

422108

Abstract:

A control loop and fluidization quality analyzer for a fluidized bed utilizes time varying pressure drop measurements. A fast-response pressure transducer measures the overall bed pressure drop, or over some segment of the bed, and the pressure drop signal is processed to produce an output voltage which changes with the degree of fluidization turbulence.

US Patent:

58770089, Mar 2, 1999

Filed:

Jul 22, 1997

Appl. No.:

8/898232

Inventors:

Carl J. Remenyik - Knoxville TN
Richard P. Woychik - Beechwood OH
David R. Patek - Loudon TN
James A. Hawk - Oak Ridge TN
John C. Turner - Clinton TN

Assignee:

Lockheed Martin Energy Research Corporation - Oak Ridge TN

International Classification:

C12M 304

US Classification:

4352851

Abstract:

An electromechanical device for driving the tip of a microinjection cannula, or needle, through the outer barrier of a blastocyst, cell, or cell nucleus for the injection of cells or other bioactive materials. Either a flexible frame or a ram moving within a base member is employed. Cannula motion is achieved by means of a piezoelectric stack and spring return system. The thrust motion over a predetermined microscopic distance is achieved without cannula setback prior to the thrust movement. Instead of specially prepared beveled and tipped needles, standard unimproved cannulas or needles can be used.