Mark C Langenohl

52140067, May 25, 1993

Jan 15, 1992

7/821507

Mark C. Langenohl - Pleasant Hills PA

Indresco Inc. - Dallas TX

C04B 3556

501 89

A lime-free silicon carbide based refractory containing about 87 wt. % silicon carbide sized -10 mesh, about 5 wt. % alumina sized -325 mesh, about 3 wt. % silica sub-micron size, and about 5 wt. % alkaliphosphate modified alumino-silicate binder. This material finds particular applicability in the construction of cast shapes and troughs for non-ferrous metal production and as a refractory lining for boiler tubes.

57535728, May 19, 1998

Jun 28, 1996

8/672252

Mark C. Langenohl - Pittsburgh PA
Christopher L. Macey - Venetia PA

Harbison-Walker Refractories Company - Dallas TX

C04B 35103
C04B 35106

501 89

Mixes suitable for casting or gunning containing a heat-resistant aggregate blend containing at least about 50 wt. % high alumina grain, silicon carbide, and zircon sand, and to the method of utilizing the same to form alkali-resistant linings in high temperature vessels that have improved resistance to build-up.

62680188, Jul 31, 2001

Feb 9, 1999

9/246486

Mark C. Langenohl - Pittsburgh PA

Harbison-Walker Refractories Company - Pittsburgh PA

B05D 500

427133

A method of applying a castable refractory composition using a form. The refractory composition consists essentially of from about 50. 0 weight percent to about 99. 9 weight percent of a high purity silicon dioxide and from about 0. 1 weight percent to about 30. 0 weight percent of a potassium silicate binder. About 0. 1 weight percent to about 30 weight percent water based upon 100 weight percent of the refractory composition may be added to achieve a pumpable consistency of the refractory composition.

55123252, Apr 30, 1996

Apr 12, 1995

8/420912

Mark C. Langenohl - Pittsburgh PA
Gustav O. Hughes - Wilkensburg PA

Indresco Inc. - Dallas TX

B05D 102

427421

An essentially non-slumping, high density, low moisture and low cement castable composition, consisting of a tempered, pumpable first component containing the castable solids and consisting essentially of a refractory aggregate, a calcium-aluminate cement, a flow aid, a deflocculating agent, and water, the water being present in the lowest amount sufficient to achieve a pumpable consistency of the tempered first component, and a flocculating agent as a second component to be added to said first component at time of installation in an amount sufficient to give the castable a dried bulk density of at least about 120 pcf. The invention also includes the method of applying such castable through a spray nozzle in which the flocculating agent is added to the tempered first component just prior to its application through a spray nozzle.

55497454, Aug 27, 1996

Oct 27, 1995

8/549018

Mark C. Langenohl - Pittsburgh PA
Gustav G. Hughes - Wilkensburg PA

Indresco Inc. - Dallas TX

C04B 732

106692

An essentially non-slumping, high density, low moisture and low cement castable composition, consisting of a tempered, pumpable first component containing the castable solids and consisting essentially of a refractory aggregate, a calcium-aluminate cement, a flow aid, a deflocculating agent, and water, the water being present in the lowest amount sufficient to achieve a pumpable consistency of the tempered first component, and a flocculating agent as a second component to be added to said first component at time of installation in an amount sufficient to give the castable a dried bulk density of at least about 120 pcf.

53407822, Aug 23, 1994

Jul 26, 1993

8/097108

Mark C. Langenohl - Pittsburgh PA

Indresco Inc. - Dallas TX

C04B 3514

501133

A vitreous silica-based plastic refractory comprising at least 50 wt. % vitreous silica having a purity of at least 99% silica, a refractory plasticizer, and a bonding system containing an alpha alumina-containing alumina capable of reacting with phosphoric acid to form an aluminum phosphate bond and phosphoric acid.

61904481, Feb 20, 2001

Feb 9, 1999

9/246473

Mark C. Langenohl - Pittsburgh PA

Harbison-Walker Refractories Company - Pittsburgh PA

C04B 2826
C09D 102

106600

A refractory composition is disclosed comprising a high purity silicon dioxide and a binder. This refractory composition may be applied by trowelling, brushing, casting, pumping and/or spraying it on a worn and/or damaged high purity silica refractory surface. A refractory castable composition is also disclosed that may be employed with forms. Further, an essentially non-slumping, sprayable refractory castable composition that is applied without the use of forms is provided. The sprayable refractory castable composition comprises (a) a tempered, pumpable first component comprising (i) a high purity silicon dioxide and a binder, and (ii) water, if needed, to achieve a pumpable consistency, and (b) a second component comprising a flocculating agent. The flocculating agent is added to the first component for achieving installation of the sprayable refractory composition in an amount to prevent slumping of the sprayable refractory castable composition.

53189329, Jun 7, 1994

Jul 28, 1993

8/099363

Mark C. Langenohl - Pittsburgh PA

Indresco Inc. - Dallas TX

C04B 3556

501 89

A plastic refractory composition in which the constituents are silicon carbide grain having a SiC content of at least 92% SiC, a calcined or reactive alumina, up to 10% bentonite, and 0. 5 to 5% boron phosphate. A phosphorous-containing liquid is used to bind the composition when used. Also disclosed are pressed shapes, particularly tiles, made from such compositions in which ball clay is substituted for the bentonite.