Abstract: A cooking device includes a gridiron; a tray positioned to catch material that falls from the gridiron; a cover formed to at least partially enclose the gridiron; a chimney having a chimney base and a chimney top, the chimney base and chimney top forming an airflow passage through the chimney; the chimney, gridiron, and cover arranged such that when the chimney base is placed over a heat source, convection occurs from the chimney base and out through the chimney top, to the cover, and from the cover toward the gridiron, the cover formed with a protruding inner wall above the chimney which forms a junction to channel substantially all of the convection in a motion outward toward sides of the cover and down toward the gridiron; the chimney base and the tray arranged such that when the chimney base is placed over the heat source, heat is radiated from the chimney base toward the tray; the chimney top and gridiron arranged such that when the chimney base is placed over the heat source, heat is radiated from the c

Abstract: A portable, smokeless, indoor/outdoor grill that utilizes an existing heat source such as a regular stove for indoor use and a propane gas tank, camp grill, or camp fire for outdoor use.

Abstract: A holographic optical element (HOE) device is mounted in wireless optical telecommunication system transceiver. The HOE device includes a developed emulsion material having an interference pattern recorded thereon, sandwiched between a pair of elements, such as a pair of clear glass plates. In operation, the HOE device uses the recorded interference pattern to diffract received light rays towards an optical processing unit of the system receiver. A transmitter unit can be positioned at least in part behind the HOE device. An opening in the emulsion material allows a light signal transmitted from the transmitter unit to be substantially unaffected by the recorded interference pattern. The transceiver can also include a spotting scope and an alignment beacon.

Abstract: A holographic optical element (HOE) device is mounted in wireless optical telecommunication system transceiver. The HOE device includes a developed emulsion material having an interference pattern recorded thereon, sandwiched between a pair of elements, such as a pair of clear glass plates. In operation, the HOE device uses the recorded interference pattern to diffract received light rays towards an optical processing unit of the system receiver. A transmitter unit can be positioned at least in part behind the HOE device. An opening in the emulsion material allows a light signal transmitted from the transmitter unit to be substantially unaffected by the recorded interference pattern. The transceiver can also include a spotting scope and an alignment beacon.