A module for forming the side walls of a cavity resonance device comprises a metal extrusion shaped in cross-section to be of a rectangular U-shape. The walls forming the free ends of the U are provided adjacent each of their free edges with first shaped portions forming part of the extrusion and extending longitudinally therealong. At least one of the walls forming the U-shape module is provided adjacent each edge of the outer surface of said wall with second shaped portions forming part of sai...

A device incorporating a cavity resonator and in which there is employed a transducer for controlling a conductive member and a further transducer subject to the same strain as the controlling transducer whereby the further transducer produces on an external terminal or lead a low frequency signal representative of the deflection of the controlling transducer.

A radio frequency antenna having a flared, discontinuous slot formed on one surface of a dielectric support structure and a feed formed on the opposite surface of such structure. The feed is disposed across a narrow portion of the slot. A housing having a cavity formed therein is provided. The dielectric support is disposed on the housing over the cavity. The cavity has a conductive wall, or deflective plate, disposed beneath a wide portion of the slot. The effects of the feed and the slot-defle...

A highly directional laser cavity depends upon a specified complex mirror to result both in high mode coupling of the fundamental transverse mode and to cause this lowest order mode to feed on essentially all of the excited state volume thus suppressing higher order modes. The mirror structure includes a central region which is convex and a peripheral region which is concave, both as viewed from the inside of the cavity.

Dental restorations are prepared by preparing a cavity within a carious tooth for receiving a dental amalgam filling; Coating the surfaces of the cavity with a layer of an adhesive-metal lining composition, the metal of the composition being characterized by the capability of being amalgamated by diffusion of the mercury from a subsequently applied dental amalgam filling, and which is further characterized by a corrosion resistance which is higher than the corrosion resistance of the subsequentl...

A combination fan jet engine nozzle plug and muffler. The combination comprises a nozzle plug structure formed from a plurality of inwardly slanted spaced apart elements. The elements form outwardly open and inwardly closed cavities. The cavities' openings are covered by porous skin material attached to the elements.

Cylindrical cavities of nuclear reactors and the like, containing a fluid under pressure, are closed by a plug consisting of a shell and a counter shell in prestressed condition.

An improved coaxial cavity resonator comprises an enclosed conductor having opposed ends, and a center cylindrical conductor in the enclosed conductor. The center conductor has smaller and larger diameter portions having respective first and second characteristic impedances. The smaller diameter portion is in contact with one end of the enclosed conductor and has a larger characteristic impedance than the larger diameter portion.

An improved abduction pillow is disclosed for post-surgical immobilization of a patient's hips and legs. The pillow includes a removable and replaceable portion for sanitary reasons and which permits access to the patient's pelvic area while maintaining hip and leg immobilization. Spare removable portions are stored within the pillow. A soft foam outer covering increases patient comfort and further enhances cleanliness. Catheter channels are provided in the removable portion of precise orientati...

A mold of the type which is utilized in injection molding machines is provided with a cavity pressure control system. The mold includes at least one cavity for molding articles from fluid synthetic resins wherein the resin may be either a thermoplastic or a thermoset substance. The mold further includes a passage which communicates with the mold cavity for feeding resin thereto. At a point along the length of the passage, preferably adjacent to the entrance of the mold cavity, heating means are ...