Lawrence Charles Zierhut

US Patent:

44738935, Sep 25, 1984

Filed:

Jun 1, 1982

Appl. No.:

6/383434

Inventors:

Lawrence G. Zierhut - Eagan MN
David S. Lo - Burnsville MN

Assignee:

Sperry Corporation - New York NY

International Classification:

G11C 1908

US Classification:

365 87

Abstract:

A nondestructive readout, random access memory system is disclosed. The memory is formed of a plurality of discrete thin ferromagnetic film memory elements in which binary data are stored as the presence, or absence, of cross-tie, Bloch-line pairs. Column lines and row lines form a matrix array of the memory elements, one at each column line, row line intersection. Cross-tie, Bloch-line pairs are formed in the memory elements by the selective coincidence of row line and column line write drive fields while readout of the presence, or absence, of the cross-tie, Bloch-line pair is by a coincident row line read drive field and a column read current signal that flows through the memory elements aligned along a selected column. A read amplifier is differentially coupled across the one fully selected memory element to detect a first, or second, opposite polarity output signal that is indicative of the presence, or absence, of a cross-tie, Bloch-line pair at the one fully selected memory element.

US Patent:

45876363, May 6, 1986

Filed:

Feb 8, 1985

Appl. No.:

6/699705

Inventors:

Gregory J. Cosimini - St. Paul MN
David S. Lo - Burnsville MN
Lawrence G. Zierhut - Burnsville MN

Assignee:

Sperry Corporation - New York NY

International Classification:

G11C 1114

US Classification:

365 87

Abstract:

The memory system incorporates a memory element storing binary digital data in the presence, vel non, of a Y-domain cross-tie. The memory element has a planar contour that is substantially symmetrical about a longitudinal axis and that has edge portions that are nowhere perpendicular or parallel to the longitudinal axis. A stabilizing magnetic field applied perpendicular to the longitudinal axis and in the plane of the memory element forms a first Neel wall along the longitudinal axis and causes the magnetization in the memory element to be formed into first and second domains on opposite sides of the Neel wall. When a writing magnetic field oriented in the plane of the memory element and perpendicular to the longitudinal axis but opposite to the stabilizing magnetic field orientation is coupled to the memory element, there is formed in the memory element a third domain separated from the first and second domains by second and third Neel walls having a join with one end of the first Neel wall. The first, second and third Neel walls form a "Y". Because of the nature of this third domain having its magnetization oriented in a direction parallel to the readout current caused to pass through the memory element, it produces a significantly greater difference in the readout signal between the readout of a stored 1 and a stored 0 than that achieved with the prior art cross-tie wall memory element.

US Patent:

60258144, Feb 15, 2000

Filed:

Nov 7, 1997

Appl. No.:

8/966412

Inventors:

George F. Nelson - Coon Rapids MN
Ray E. Artz - Apple Valley MN
Lawrence Zierhut - Burnsville MN

Assignee:

New Holland North America, Inc. - New Holland PA

International Classification:

H01Q 112

US Classification:

343878

Abstract:

An antenna unit for measuring the velocity of a flowing material by the Doppler effect is particularly suited for use where only a limited space is available. The antenna unit comprises a support block having first and second surfaces disposed at an acute angle (optimally 45. degree. ) relative to each other. A printed circuit antenna card having thereon a high gain antenna comprising a phased array of antenna elements is mounted to the second surface and radiates microwave energy toward the first surface. A plate having an opening therein is disposed adjacent the first surface, the plate being made of a material which absorbs radiated energy incident thereon. The support block is provided with a recess for receiving an absorber wedge which absorbs the energy radiated in near side lobes. The absorber wedge and plate shape the radiation pattern so that energy radiated by the antenna intercepts the material at an angle of 45. degree. +-. 15. degree. when the first surface is disposed parallel to the axis of flow.

US Patent:

44109636, Oct 18, 1983

Filed:

Oct 5, 1981

Appl. No.:

6/308296

Inventors:

David S. Lo - Burnsville MN
Maynard C. Paul - Bloomington MN
Lawrence G. Zierhut - Eagan MN

Assignee:

Sperry Corporation - New York NY

International Classification:

G11C 1908

US Classification:

365 87

Abstract:

An improved magnetic memory system in which binary data are stored as cross-tie, Bloch-line pairs, which are serially propagated downstream along a cross-tie wall and a magnetizable layer by appropriate drive fields. The magnetizable layer is configured into a data track whose two mirror-image, opposing edges are formed into patterns of asymmetrically shaped edges which form successive narrow portions, or necks, with wide portions therebetween, and which shaped edges are formed about the geometric central line of the data track. The cross-ties are structured in the data track by opposite-edge necks at which the ends of the cross-tie are magnetically stable. The improvement comprises: forming a serpentine energy well along and about the geometric centerline of the data track, which energy well has the same period as the shaped edges; displacing the necks of the opposing edges one half the distance between adjacent necks along each edge; and, propagating the cross-tie, Bloch-line pairs along the data track by rocking alternate ends of the cross-tie from its associated neck to the next adjacent downstream neck.