A crystal-controlled oscillator of integrated circuit design, comprising, a three-stage direct-coupled amplifier employing insulated gate field-effect-transistors and overall resistive negative (DC) feedback for bias stabilization thereof. The oscillator is designed to operate at a frequency at which the reactive network, including the inherent interelectrode capacitances of the field-effect-transistors, of the amplifier results in a loop phase shift which satisfies the Barkhausen Criterion.

A translucent spherical lamp with dimmer switch and flasher controls, a radio receiver and microphone, and an externally grooved polygonal base.

A crystal holder is provided which is capable of supporting any one of a plurality of piezoelectric crystals having different preselected diameters. The crystal holder includes two side portions, each portion having a stair step-like structure, the stair steps of one side portion leading upwardly and away from the stair steps of the remaining side portion. Each step of one side portion is respectively horizontally aligned with a corresponding step of the remaining side portion such that each ste...

A stepped curved crystal for an x-ray crystal spectrometer and the like providing more effective area and hence improved signal to background ratio over conventional curved crystals. A stepped crystal formed of a plurality of crystal strips assembled in a flat configuration and bent to place the steps on a focal circle of radius r, with the crystal atomic planes on circles of radius substantially 2r.

A novel structure of semiconductor crystal of compound semiconductor material has a plurality of unit layers stratified periodically on a substrate. Each unit layer comprises at least one first semiconductor layer consisting of a first atom mono layer of a first element and a second atom mono layer of a second element, the first and second atom mono layers being stratified one over another alternately in a first deposition order, and at least one second semiconductor layer consisting of the firs...

Three or more resonator-forming electrode pairs and a crystal wafer on which they are mounted, form a multiresonator crystal filter with respective inductors connected to two of the pairs. The electrode pairs have masses such as to tune the frequency exhibited by the unconnected resonator to a frequency f.sub.p. The inductors tune the interelectrode capacitances of the connected resonators to the frequency f.sub.p. The masses of electrodes in the connected resonators tune the mechanical resonanc...

The coupling between two loosely coupled electrode pairs mounted on the same crystal body to form a monolithic filter is vernier adjusted by plating an area in the interelectrode region.

Mixtures of para-nitrochlorobenzene crystals and a liquid, ordinarily comprising the mother liquor of the crystals are continuously separated in one or more cylindrical presses in at least two stages. Reduction of the interstitial space causes the mother liquor to be forced out of the drainage aperatures thus purifying the crystals.

Mixtures of crystals and a liquid, ordinarily comprising the mother liquor of the crystals are continuously separated by feeding the mixture into a screw type press having drainage apperatures, thereby subjecting the crystals with the mother liquor entrapped therein to pressures sufficient to substantially reduce the interstitial space between crystals. Reduction of the interstitial space causes the mother liquor to be forced out of the drainage aperatures thus purifying the crystals. This achie...

Improved laser system gain is achieved by using Gadolinium to totally replace the Yttrium in a Lithium Yttrium Fluoride (YLF) host crystal so as to increase the amount of Neodymium which can be doped into the host crystal.