Donald C. Johnson
Real Estate Commission in Wilmington, DE

4190530, Feb 26, 1980

Apr 3, 1978

5/892508

Jesse G. Forsythe - Media PA
Donald R. Johnson - Wilmington DE
Linda M. St. Onge - Newark DE

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 1506

210 31R

Samples to be analyzed, such as physiological fluids (blood, urine, etc. ) may be processed using centrifugal techniques. The sample is centrifugally passed through a separation column to extract the desired component from the aqueous phase. Next, the extracted component is washed free of extraneous materials and then eluted from the separating column by centrifugally passing a suitable solvent therethrough. The aqueous phase and extracted components are collected in separate containers. To facilitate this method, an apparatus is provided that accommodates switching between fluid flow paths in a centrifuge. The centrifuge utilizes a swinging bucket rotor which contains a separating column, the top end of which employs a fluid reservoir for holding the sample to be extracted. Fluids are passed through the separating column (a first flow path) from a central distributor in the centrifuge rotor while in operation. An outer ring of swinging buckets holds two receptacles (the second and third flow paths), one for the aqueous phase and one for the solvent phase containing the sample extract or physiological component.

4066412, Jan 3, 1978

Aug 16, 1968

4/753197

Donald R. Johnson - Wilmington DE
Richard G. Nadeau - Claymont DE
Gerrit Nieuweboer - Claymont DE
William L. Truett - Blackwood NJ

E. I. Du Pont de Nemours and Company - Wilmington DE

G01N 3316, G01N 2124

23253R

An apparatus for automatically performing analytic procedural steps on a fluid contained in a disposable deformable test pack. The apparatus consists of a means for filling the test pack with sample fluid, a means for controlling the environment of the test pack, a means for initiating reactions within the test pack, a means for analyzing the fluid in the test pack, and a transport means designed to hold the test pack and to transport it between the various operating stations. Associated circuitry combining method switchng and control logic make the operation of the instrument fully automatic.

3940050, Feb 24, 1976

Oct 4, 1974

5/512044

Donald R. Johnson - Wilmington DE
James R. Sawers - Wilmington DE

E. I. Du Pont de Nemours and Company - Wilmington DE

B23K 3102

228122

Disclosed herein is an improved method for joining diamond to metal using a gold-tantalum or gold-niobium solder. The method utilizes powdered material, and a clamp to keep the diamond in place during the soldering step. The article produces has higher mechanical stability than articles produced by known procedures.

RE29725, Aug 8, 1978

May 7, 1970

5/035438

Donald R. Johnson - Wilmington DE
Richard G. Nadeau - Claymont DE
Gerrit Nieuweboer - Claymont DE
William L. Truett - Blackwood NJ

E. I. du Pont de Nemours and Company - Wilmington DE

G01N 3316, G01N 2124

23230R

Performing analytical tests more easily, quickly and accurately by using a specially designed pouch-like container of pliable material. The container has within it a plurality of compartments, each compartment being capable of containing a different reagent and each compartment also being capable of releasing its contained reagent, independently of any other reagents present in the other compartments, into the area of the container not occupied by compartments. This latter area of the container is also adapted to receive the test sample for reaction with any single reagent or any combination of reagents released from the compartments.

4214993, Jul 29, 1980

Apr 3, 1978

5/892507

Jesse G. Forsythe - Media PA
Donald R. Johnson - Wilmington DE
Linda M. St. Onge - Newark DE

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 2702

210282

An apparatus for separating fluids is formed essentially of three pieces which may be nested together to form a stacked array. The three pieces are a cap, an extraction cartridge housing a separating column, and a primary recovery cup. A secondary recovery cup may also be nested onto the lower end of the waste cup. The primary recovery cup has interior flanges for positioning and protecting the bottom end of the column against damage. Each of the elements has an enlarged upper portion forming an exterior step which facilitates mounting in the swinging bucket of a centrifuge. The column itself may comprise particles of a suitable separatory material with the top and the bottom of the particles retained by porous supports.

4483885, Nov 20, 1984

Nov 4, 1983

6/548637

Edward M. Chait - Wilmington DE
Mary L. Gianelli - Wilmington DE
Donald R. Johnson - Wilmington DE

E. I. Du Pont de Nemours & Company - Wilmington DE

G01N 2726

427 58

A thin film electropheretic device formed of layers with a substrate, electrodes on the substrate and a gel form over both.

4443319, Apr 17, 1984

Sep 30, 1982

6/430836

Edward M. Chait - Wilmington DE
Mary L. Gianelli - Wilmington DE
Donald R. Johnson - Wilmington DE

E. I. Du Pont de Nemours and Company - Wilmington DE

G01N 2726, G01N 2728

204299R

A thin film electropheretic device formed of layers with a substrate, electrodes on the substrate and a gel form over both.