A caisson and connecting conductor pipe sections are lowered to a predetermined position on the ocean underwater floor. A drill stem having a combined drilling and reaming tool is positioned within the conductor pipe and caisson. Drilling mud is reversed-circulated through the annular space between the conductor pipe and caisson and the drill stem, the drilling mud returning through the drill stem. The tool mounted on the drill stem is utilized to drill to a predetermined depth whereupon one or ...

A catoptric lens arrangement which is adapted to use with high power radiant energy, as from a laser, is shown. The entrance mirror of the contemplated lens arrangement has a convex reflective surface so that the radiative flux density at the entrance mirror is less than the radiative flux density in a laser beam. The various mirrors in the contemplated lens arrangement further are arranged so that each such mirror may be conductively cooled with aperture blockage reduced to a minimum or elimina...

An oscillator for very high microwave or millimeterwave frequencies employs a pair of negative-resistance semiconductive devices, each mounted in its own resonant cavity. The two cavities are coupled together by an iris in their common wall. An output waveguide is coupled symmetrically to both sides of the common wall to load both cavities equally. An adjustable mode-control element projects into the cavity to the near vicinity of one of the devices to induce the oscillator to start in the desir...

A mold having a plurality of cavities for forming articles having complex shapes such as the unitary sole and heel tread member of a shoe wherein the article cast is of a foamed material such as polyurethane, specific charges of which are injected into the cavities in a liquid form, and expanded therein, each of the articles being expanded to a predetermined size, shape and density standard, the mold for such articles being formed of first and second mold members defining the molding cavities th...

The invention relates to a method of manufacturing a semiconductor device having a schottky junction, for example, a schottky diode, in which a masking layer which is provided with a window is provided on a semiconductor body and at the area of the window a cavity extending to below the masking layer is provided in but not through said semiconductor body, the schottky electrode layer which extends to below the masking layer but not up to the masking layer being provided in said cavity by vapour-...

An assemblage of a rivet for securing at least a pair of sheets or other members, wherein the rivet is formed with a cavity in its upset end of predetermined dimensions with respect to the sheets and the remainder of the rivet. The cavity preferably terminates in the thickness of the bottom sheet, thus facilitating rivet upset while providing maximum strength.

A device for the inspection of body cavities has collapsible walls. The walls are folded both during storage and during insertion into and retraction from the body cavity to be examined. After insertion, means are provided for unfolding the walls, thereby expanding the cavity, which permits access to the cavity for the purposes of inspection, diagnosis, or treatment. The walls are supported by axial rods running along the wall periphery. In the preferred embodiment, the walls are double layer pl...

A three section stripline coupler is disclosed wherein the conducting strips of the center section overlie each other and those of the end sections are displaced sideways relative to each other. Cavities are formed in the ground planes of the stripline over the center section and the cavities are filled with dielectric material to increase the coupling between the conducting strips at the center section.

A seal is disclosed for a tank having a floating roof wherein a mounting member is pivoted on the floating roof and a sealing member is carried by the free end of the mounting member for sealing a vapor cavity between the floating roof and the tank.

An oral cavity cleaner including a pump unit for supplying a pulsating stream of high-pressure fluid, and a toothbrush unit connected thereto via a flexible conduit. The toothbrush unit includes an actuating member responsive to the pressure of the pulsating stream of fluid to provide a reciprocatory movement, a toothbrush connected to the actuating member, a valve section brought to an open position when the movement of the actuating member has exceeded a predetermined value, and an operating m...