Thomas H Peters

US Patent:

6790669, Sep 14, 2004

Filed:

Dec 14, 2001

Appl. No.:

10/018629

Inventors:

Curtis D. Pfeiffer - Midland MI
Nile N. Frawley - Midland MI
Thomas L. Peters - Midland MI
Philip J. Savickas - Midland MI
David R. Albers - Midland MI
Steven J. Gluck - Lake Jackson TX
Lawrence W. Nicholson - Freeland MI
Jose B. Esquivel H. - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

G01N 3014

US Classification:

436161, 436 63, 436 71, 436 86, 436 94, 436174, 436178

Abstract:

A chemical analysis method for determining chemically related differences between subject biological material such as genetically modified plant material and control biological material such as genetically unmodified plant material, which method includes at least the following six steps. The first step is to contact the subject biological material with a fluid extractant, such as a mixture of water, isopropanol and potassium hydroxide, to produce a fluid extract of the subject biological material. The second step is to contact the control biological material with the fluid extractant to produce a fluid extract of the control biological material. The third step is to chromatograph the fluid extract of the subject biological material, for example, gas or fluid chromatography, to produce a chromatogram of the fluid extract of the subject biological material. The fourth step is to chromatograph the fluid extract of the control biological material to produce a chromatogram of the fluid extract of the control biological material. The fifth step is to determine the differences between the chromatograms, for example, by using the method of U. S. Pat. No.

US Patent:

43766412, Mar 15, 1983

Filed:

Dec 14, 1981

Appl. No.:

6/330343

Inventors:

Terry J. Nestrick - Midland MI
Thomas L. Peters - Midland MI
Lester L. Lamparski - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01D 1508

US Classification:

55 67

Abstract:

In the production of a wall coated open tubular capillary chromatographic column, improved deactivation of the inner surface of a glass or fused silica capillary tube prior to coating with stationary phase is obtained by a multi-step process whereby siloxane polymer molecules are chemically bonded to the capillary inner surface. The process comprises multiple cycles of successive reactions with silicon tetrachloride and a diorganodichlorosilane vapor with intermediate hydrolyses and a final capping reaction with a triorganochlorosilane. The deactivated surface is adapted to coating with an apolar liquid stationary phase.

US Patent:

46844708, Aug 4, 1987

Filed:

Aug 9, 1985

Appl. No.:

6/764268

Inventors:

Thomas L. Peters - Midland MI
Timothy S. Stevens - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01D 1301

US Classification:

210639

Abstract:

The overall mass transport efficiency of hollow fiber membrane separation cells is increased by introducing segmented flow into the bores of the fibers. The invention is preferably practiced by dispersing a gas segmentation phase into a continuous liquid phase and feeding the dispersion into the bores of the fibers to form alternating flowing segments of gas and liquid.

US Patent:

48348775, May 30, 1989

Filed:

Jun 28, 1988

Appl. No.:

7/213030

Inventors:

Thomas L. Peters - Midland MI
Timothy S. Stevens - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01D 1301

US Classification:

2101981

Abstract:

The overall mass transport efficiency of hollow fiber membrane separation cells is increased by introducing segmented flow into the bores of the fibers. The invention is preferably practiced by dispersing a gas segmentation phase into a continuous liquid phase and feeding the dispersion into the bores of the fibers to form alternating flowing segments of gas and liquid.

US Patent:

44591730, Jul 10, 1984

Filed:

Jul 22, 1983

Appl. No.:

6/516488

Inventors:

Thomas L. Peters - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B44C 122
C03C 1500
C03C 2506

US Classification:

156663

Abstract:

An improved process for etching (eroding) the inner surface of a glass capillary column in which ammonium bifluoride in liquid methanol is passed slowly through the capillary bore for a prolonged period, followed by rinsing with methanol, thereafter a gradually diluting rinse mixture of methanol and water, and finally a pure water rinse. A very fine structured etch of uniform depth is produced with no apparent air entrainment making the columns suitable for all standard stationary phase coating procedures.

US Patent:

50010719, Mar 19, 1991

Filed:

Oct 6, 1988

Appl. No.:

7/254538

Inventors:

Paul L. Morabito - Midland MI
Joseph F. Hiller - Midland MI
Terrence McCabe - Midland MI
Thomas L. Peters - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

G01N 3002

US Classification:

436161

Abstract:

A method for on-column injection of large sample volumes using the retention gap technique in capillary gas chromatography for sample components of interest that would be obscured by the large solvent peak otherwise inherent in the technique. This interference from the large solvent peak is removed by venting carrier flow from the retention gap to waste for a limited time, long enough to discard much of the solvent without serious loss of the sample component of interest.