Roger L Bredeweg

42345413, Nov 18, 1980

Mar 2, 1979

6/016975

Roger L. Bredeweg - Stevensville MI
George J. Sitek - Stevensville MI

Leco Corporation - St. Joseph MI

G01N 3112
B01D 4104
B08B 104
F23J 300

422 78

For use in a combustion furnace for analytical apparatus in which a specimen is combusted in a combustion chamber and gases therefrom are withdrawn for analysis, a cleaning apparatus mounted at one end of the combustion chamber. The cleaning apparatus includes a housing sealably mounted to the combustion chamber and containing a movable cleaning element for abrading the interior walls of the combustion chamber. A shield is positioned between the cleaning element and the combustion chamber such that during combustion of a specimen, the cleaning element is effectively shielded from the high temperature combustion. In one embodiment, the housing also includes a filter between gas supply and exhaust passages and apparatus for self-cleaning of the filter.

43283861, May 4, 1982

Sep 24, 1980

6/190358

Roger L. Bredeweg - Stevensville MI

Leco Corporation - St. Joseph MI

H05B 300

373118

A crucible assembly for use in an analytical furnace for the fusion of a sample includes a graphite heating crucible of cylindrical construction having one end open and an enclosed lower end with a positioning member interior to the interior cylindrical wall for receiving and positioning a separate sample holding crucible of cylindrical construction having an open upper end and an enclosed lower end. The heating crucible has an annular upper contact surface for engaging a first electrode and an annular lower contact surface for engaging a second electrode and positions the sample holding crucible in the zone of maximum heat in spaced relationship from the opposite ends of the heating crucible.

42902967, Sep 22, 1981

Nov 16, 1979

6/095508

Roger L. Bredeweg - Stevensville MI
George J. Sitek - Stevensville MI

Leco Corporation - St. Joseph MI

G01N 3100

73 1G

A combustion analyzer for the analysis of the carbon and sulfur content in steel includes a gas flow system whereby a carrier gas flows through a combustion chamber and gaseous by-products of combustion flow through one or more infrared cells for analysis. In order to correct for the inherent nonlinearity of the measurement of concentration by the infrared cell or cells, a linearity correction system is provided. In the linearity correction system, discrete levels of concentration of known gases are dosed into the system and the detected concentration measured. Scaling factors are determined by an iterative process employing a microprocessor which scaling factors are then employed to correct for the nonlinearity in sample measurements. In one embodiment of the invention, the flow of the specimen gas employed for dosing the system is measured as a function of the pressure differential across a given size flow restrictor using an improved control valve and dosing manifold.

42384508, Dec 9, 1980

Feb 21, 1979

6/013031

Roger L. Bredeweg - Stevensville MI
Edward P. Povilaitis - Coloma MI
Ramsey G. Reed - St. Joseph MI

Leco Corporation

G01N 3112
G01N 3300

422 63

A system for stepwise advancing a row of crucibles individually through a loading station of an induction furnace includes a plurality of articulated fingers for gripping each of the crucibles. The fingers are mounted to a first slide for movement along the direction of advancement of the crucibles. The first slide is mounted to a second slide for advancing and retracting the fingers into crucible engaging and disengaging positions, respectively. Control means are provided for controlling the movement of the slides and the articulated fingers sequentially to stepwise advance the crucibles through the loading station.

46220097, Nov 11, 1986

Sep 20, 1985

6/778309

Roger L. Bredeweg - Stevensville MI

Leco Corporation - St. Joseph MI

F27B 1400
G01N 3100
G01N 3112

432156

The specification discloses an analyzer for determining the carbon, hydrogen, and nitrogen content of an organic material. The analyzer includes a vertically oriented, U-shaped furnace including a combustion chamber containing a crucible in which the sample is combusted into constituent gases and a reagent chamber containing a reagent through which the constituent gases must pass. A lance extends into the combustion chamber to guide the sample into the crucible and to direct oxygen onto the sample combusting in the crucible. The analyzer further includes an equilibration vessel and means for conveying the constituent gases to the vessel and past CO. sub. 2 and H. sub. 2 O infrared cells to monitor the products of combustion. Means are provided for conveying the equilibrated gases past the infrared cells to obtain readings relating to carbon and hydrogen content. A doser doses an aliquot of the equilibrated gas into a nitrogen measurement apparatus to obtain a reading relating to nitrogen content.

45739102, Mar 4, 1986

Feb 8, 1985

6/699574

Roger L. Bredeweg - Stevensville MI

Leco Corporation - St. Joseph MI

F27B 1400
G01N 3112

432156

The specification discloses an analyzer for determining the carbon, hydrogen, and nitrogen content of an organic material. The analyzer includes a vertically oriented, U-shaped furnace including a combustion chamber containing a crucible in which the sample is combusted into constituent gases and a reagent chamber containing a reagent through which the constituent gases must pass. A lance extends into the combustion chamber to guide the sample into the crucible and to direct oxygen onto the sample combusting in the crucible. The analyzer further includes an equilibration vessel and means for conveying the constituent gases to the vessel and past CO. sub. 2 and H. sub. 2 O infrared cells to monitor the products of combustion. Means are provided for conveying the equilibrated gases past the infrared cells to obtain readings relating to carbon and hydrogen content. A doser doses an aliquot of the equilibrated gas into a nitrogen measurement apparatus to obtain a reading relating to nitrogen content.

42821835, Aug 4, 1981

Nov 9, 1978

5/958967

Roger L. Bredeweg - Stevensville MI
Larry S. O'Brien - St. Joseph MI
Charles B. Vallance - Berrien Springs MI

Leco Corporation - St. Joseph MI

G01N 3112

422 78

A combustion system includes a cylindrical horizontally extending ceramic combustion tube positioned in a furnace. The combustion tube is enclosed at one end and open at the opposite end for receiving a combustion boat carrying a sample to be combusted for subsequent analysis. The tube also receives a support block loosely positioned along the bottom of the tube and contacting the enclosed end for centering the combustion boat and for supporting one end of a sample withdrawal tube with an open end extending in the space surrounding the combustion boat and having an opposite end extending from the combustion tube. A lance tube also extends into the combustion tube for directing the flow of an oxidizing gas such as oxygen into the combustion boat to facilitate oxidation of a sample. The open end of the combustion tube is effectively sealed by a curtain of gas supplied by a flood tube having a plurality of longitudinally and angularly spaced slots and supplied with a suitable gas for blocking the open end of the tube from admission of atmospheric contaminants and preventing the escape of gasses from the combusted sample.

45253285, Jun 25, 1985

Mar 5, 1982

6/355214

Roger L. Bredeweg - Stevensville MI

Leco Corporation - St. Joseph MI

G01N 122
G01N 3110
G01N 3112

422 80

The specification discloses an analyzer for determining the carbon, hydrogen, and nitrogen content of an organic material. The analyzer includes a vertically oriented, U-shaped furnace including a combustion chamber containing a crucible in which the sample is combusted into constituent gases and a reagent chamber containing a reagent through which the constituent gases must pass. A lance extends into the combustion chamber to guide the sample into the crucible and to direct oxygen onto the sample combusting in the crucible. The analyzer further includes an equilibration vessel and means for conveying the constituent gases to the vessel and past CO. sub. 2 and H. sub. 2 O infrared cells to monitor the products of combustion. Means are provided for conveying the equilibrated gases past the infrared cells to obtain readings relating to carbon and hydrogen content. A doser doses an aliquot of the equilibrated gas into a nitrogen measurement apparatus to obtain a reading relating to nitrogen content.