Abstract: A weir assembly is disclosed in which the size and shape of the opening can be easily changed, by utilizing a sizing insert system. In one embodiment, the sizing insert comprises a mechanical iris. The position of the opening is easily adjustable by utilizing at least one positioning stage that is fastened to the sizing insert. Spring plungers are utilized for retention of the transparent weir plate within the vertical channels of a water trough. A center-finder is utilized to approximately position the opening in relation to an extrusion die.

Abstract: An aircraft cockpit door system is disclosed comprising a bulletproof cockpit door and bulkhead, and a bulletproof lavatory isolation door and bulkhead. A logic control circuit alternately locks the two doors, keeping the cockpit crew at all times isolated from other persons aboard the craft to ensure the safety of the cockpit crew, and ultimately the aircraft.

Abstract: Antimicrobial polymeric tubing is disclosed comprising a polymer compounded with a silver ion-emitting additive. In a second embodiment, the tubing is coextruded, and the silver ion-emitting additive is compounded only with the polymer located on the interior of the tube.

Abstract: A lighted dental prop is disclosed comprising a wedge shaped bite block and a light source. The bite block utilizes reflected fiberoptic light or an internal light source to provide broad illumination to the mouth.

Abstract: A disposable nozzle for a dental syringe is disclosed comprising an inner tube and an outer tube. The outer tube is constructed with depressions for inner tube retention. The depressions also serve as indicia. The proximal end of the outer tube has at least one indentation across its radius to prevent blockage of media flows.

Abstract: A sleeve for disposable dental instrument nozzles is disclosed. The sleeve is designed to maintain sterility from the point of manufacture until actual use with a patient. Both ends of the sleeve are designed to be easily punctured or removed.

Abstract: A dental syringe is disclosed wherein finger actuated shutoff valves control air and water flows to a discharge nozzle. The shutoff valves are constructed with a groove into which the media inlet barb is inserted for retention. All O-rings are retained below the surface of the syringe head. The discharge nozzle is constructed with a retaining groove and retained with a snap ring.