Henrik Rainer Heikel

US Patent:

48637114, Sep 5, 1989

Filed:

Sep 29, 1987

Appl. No.:

7/102174

Inventors:

Henrik R. Heikel - Leland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C01G 23047
C22B 300

US Classification:

423610

Abstract:

A process for preparing nodular pigmentary titanium dioxide by grinding and mixing a titanium-bearing material, such as sorelslag, with an alkali metal compound such as sodium hydroxide, and roasting the mixture. The roasted material is ground followed by washing and filtering. Thereafter, the solid residue is digested with hydrochloric acid for a time and temperature sufficient to form nodular-shaped solids. After removing the acid by filtration and washing the solid residue, the residue is calcined to provide a nodular titanium dioxide pigment.

US Patent:

47599162, Jul 26, 1988

Filed:

Jan 21, 1986

Appl. No.:

6/821507

Inventors:

Henrik R. Heikel - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C01G 23047
C01G 23053

US Classification:

423 71

Abstract:

A process for preparing pigmentary titanium dioxide by grinding and mixing a titanium-bearing material, such as sorelslag, with an alkali metal compound such as sodium hydroxide, and roasting the mixture. The roasted material is ground followed by washing and filtering. Thereafter, the solid residue is digested with hydrochloric acid. After removing the acid by filtration and washing the solid residue, the residue is calcined to provide a titanium dioxide pigment.

US Patent:

39416100, Mar 2, 1976

Filed:

May 17, 1971

Appl. No.:

5/144247

Inventors:

John Maskal - Ludington MI
Ivan M. Thompson - Ludington MI
Henrik R. Heikel - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C09C 300

US Classification:

106308M

Abstract:

Paper possessing outstanding opacity, whiteness and gloss characteristics containing a magnesium hydroxide pigment having about 1 to 5 weight per cent calcium ion concentration in solid solution therewith and methods of manufacturing such paper are provided. The pigment is contained either as a paper filler or as a component of a coating pigment composition.

US Patent:

41804490, Dec 25, 1979

Filed:

Sep 18, 1978

Appl. No.:

5/943020

Inventors:

Henrik R. Heikel - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C25B 1300
C25B 1306
C25B 1308

US Classification:

204296

Abstract:

Improved asbestos-containing diaphragms and mats are prepared by bonding the asbestos fibers to one another by pyrolyzing an organic titanate in situ.

US Patent:

42149711, Jul 29, 1980

Filed:

Aug 14, 1978

Appl. No.:

5/933303

Inventors:

Henrik R. Heikel - Midland MI
James J. Leddy - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B05D 512

US Classification:

204290F

Abstract:

A method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a greater valve metal to ruthenium weight ratio than the first solution. At least a portion of the substrate is contacted with a first liquid solution containing from about 0. 25 to about 50 milligrams per milliliter ruthenium, and the valve metal in an amount of from about 0. 06 to about 50 milligrams per milliliter, of the solution. The weight ratio of the valve metal to ruthenium in the first solution is from about 1:4 to about 2:1. The so-contacted surface is heated to oxidize the deposited ruthenium and valve metal values. Thereafter at least the oxidized surface is contacted with a second solution containing dissolved valve metal and ruthenium values in a weight ratio of from about 20:1 to about 2:1 and heated to oxidize the deposited metal values.

US Patent:

54293723, Jul 4, 1995

Filed:

Jun 27, 1994

Appl. No.:

8/265739

Inventors:

Laura H. Spaziani - Calgary, Alberta T2M-4C3, CA
Henrik R. Heikel - Leland MI

International Classification:

A63F 900

US Classification:

273309

Abstract:

This invention provides a portable jig-saw puzzle work board comprising a rectangular, four-sided open frame having a fitted bottom interior work surface and a removable fitted transparent shatter-proof window that is securely and releasably positionable relative to the work surface such that puzzle pieces are held in place on the work surface when the window is in place and the position of the work board is changed.

US Patent:

41121406, Sep 5, 1978

Filed:

Apr 14, 1977

Appl. No.:

5/787418

Inventors:

Henrik R. Heikel - Midland MI
James J. Leddy - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B05D 512

US Classification:

427126

Abstract:

A method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a greater valve metal to ruthenium weight ratio than the first solution. At least a portion of the substrate is contacted with a first liquid solution containing ruthenium and the valve metal in amounts of from about 1 to about 50 milligrams per milliliter of the solution. The weight ratio of the valve metal to ruthenium in the first solution is from about 1:4 to about 2:1. The so-contacted surface is heated to oxidize the deposited ruthenium and valve metal values. Thereafter at least the oxidized surface is contacted with a second solution containing dissolved valve metal and ruthenium values in a weight ratio of from about 20:1 to about 2:1 and heated to oxidize the deposited metal values.

US Patent:

41167104, Sep 26, 1978

Filed:

Feb 5, 1975

Appl. No.:

5/547146

Inventors:

Henrik R. Heikel - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C04B 3118

US Classification:

106290

Abstract:

A method of providing a particulate suitable for use in, for example, coating compositions, such as paints. The described method comprises depositing a metal on a substrate by, for example, electroless or vapor deposition methods. The metal deposit is then removed from substrate to provide a plurality of distinct metal platelets suitable for combination with a carrier and use in a coating composition.