Daniel Alan Olsen
Physical Therapy at Red Cloud Ct, Fort Collins, CO

5733105, Mar 31, 1998

Mar 19, 1996

8/618367

Carl D. Beckett - Vancouver WA
Kevin D. O'Hara - Washougal WA
Daniel B. Olsen - Fort Collins CO
Steven E. Soar - Vancouver WA
Glenn E. Siemer - Vancouver WA

Micropump, Inc. - Vancouver WA

F04B 112

417269

A reciprocating piston pump provides pulseless delivery of liquid. It is suitable for use in compact environments or for the delivery of small amounts of liquid, as in chromatographic analysis devices. The pump includes two pistons with pumping chambers that are alternately connected to inflow and outflow lines through a control valve. The control valve moves between a first position in which inflow is directed to the first piston chamber and outflow to the second piston chamber, and a second position in which outflow is directed to the first piston chamber and inflow is directed to the second piston chamber. Each outflow pulse from the piston is sustained longer than each inflow pulse, and the outflow pulses are staggered and partially superimposed to provide substantially pulseless delivery of liquid from the pump. A rotating cam moves the pistons of the pumps and the control valve between their operating positions described above. The cam rotates at a constant speed around an axis that is parallel to the axis of movement of the piston pumps.

5751291, May 12, 1998

Jul 26, 1996

8/690433

Daniel M. Olsen - Fort Collins CO
Noel D. Scott - Fort Collins CO
Robert J. Casey - Fort Collins CO

Hewlett-Packard Company - Palo Alto CA

G06T 1540

345422

An occlusion culling circuit for use in a graphics computer receives graphics primitives data including x and y coordinates for each pixel, a z depth value, and r, g, b, and a or index color data. For each group of primitives, the graphics computer scans the primitive and determines a volume which completely bounds the primitive. The z depth values for the pixels comprising the bounding volume are then compared by the occlusion culling circuit to the depths of the pixels in the already rendered primitives to determine whether any pixels in the incoming primitive are visible. If no pixels are visible, the occlusion culling circuit clears the result register and receives the next graphics primitive. If, on the other hand, one or more pixels is visible, the occlusion culling circuit completely renders the primitives bounded by the bounding volume. Since the graphics primitives which are totally occluded can bypass the more intensive pixel by pixel processing and storage, the speed and efficiency of the graphics computer can be significantly increased.

6094200, Jul 25, 2000

Feb 6, 1998

9/020189

Daniel M. Olsen - Fort Collins CO
Noel D. Scott - Fort Collins CO
Robert J. Casey - Fort Collins CO

Hewlett-Packard Company - Palo Alto CA

G06T 1540

345422

An occlusion culling circuit for use in a graphics computer receives graphics primitives data including x and y coordinates for each pixel, a z depth value, and r, g, b, and a or index color data. For each group of primitives, the graphics computer scans the primitive and determines a volume which completely bounds the primitive. The z depth values for the pixels comprising the bounding volume are then compared by the occlusion culling circuit to the depths of the pixels in the already rendered primitives to determine whether any pixels in the incoming primitive are visible. If no pixels are visible, the occlusion culling circuit clears the result register and receives the next graphics primitive. If, on the other hand, one or more pixels is visible, the occlusion culling circuit completely renders the primitives bounded by the bounding volume. Since the graphics primitives which are totally occluded can bypass the more intensive pixel by pixel processing and storage, the speed and efficiency of the graphics computer can be significantly increased.