Abstract: An open frame single turn potentiometer with a helical coil spring wiper including a resilient member situated between the substrate and the rotor. The resilient member consists of an annular ring preferably having a "D-shaped" or hemispherically shaped cross section. This "D" ring member performs the function of providing a spring action between the substrate and the rotor; means for controlling torque; and means for adjusting to the build-up in tolerences between the various component elements of the trimmer, thereby achieving optimum electrical and mechanical performance.

Abstract: A CATV subscription service control device has a switched buffer to prevent jamming signals from a switched attenuator from propagating throughout the system. The attenuator uses mutual inductance to achieve a high degree of attenuation.

Abstract: A miniature multiple indicator light package having a plurality of light emitter devices aligned in a row, positioned on a unitary plastic base, lenses of the light emitters projecting through holes in the cover. The package is assembled by placing the cover over the light emitters while they are above final position, and then rotating the cover and pressing the combination together.

Abstract: An electrophoretic display device in which an colloidal suspension of pigment particles is contained between a pair of electrodes, and means are provided in the structure of the electrodes of the cell for the establishment of a voltage threshold for the transport of pigment particles. This threshold permits the changing of the spatial distribution of pigment particles in specifically defined regions of the display cell.

Abstract: A sectional terminal block assembly has identical interlocking sections held together by the electrical elements. Each section has a projecting portion, and a recess portion shaped to receive the projecting portion of an adjoining section, the projecting and recess portions having interlocking shapes to prevent transverse motion or twist. Each contact element has an arm locked in aligned transverse slots in the projecting and recess portions to prevent relative motion longitudinally. A simple plastic cover snaps over the top of barriers between adjacent contact elements, and is pivotal upward from either side to allow access to the contacts.

Abstract: An electric motor has a stator construction which includes identical facing cup shaped members having a circumferential surface which includes a plurality of tabs and recesses. The tabs of one cup shaped member are dimensioned and configured for an engagement with the recesses of the other cup shaped member to positively position axially and radially each cup shaped member relative to the other. In one form the tabs may have a negative taper such that the base extremity of the tab has a smaller width than the other extremity of the tab. The negative taper produces a more pronounced interference fit and causes the cups to snap together without the necessity for cementing, welding, or other metal joining process. Each cup in one form is also provided at a plurality of angularly spaced recesses for receiving two identical generally planar plates having cooperating tabs and upstanding pole pieces. The recesses in one form extend along the circumferential surfaces to the tabs.

Abstract: Transient voltage overshoot is known to occur when primary current in a multi-phase X-ray generator high voltage transformer is switched on. Transient overshoot is supressed by connecting an impedance in series with the primary current switch. A second switch short circuits the series impedance after a time delay whose length is controlled as a direct function of the primary voltage and as an inverse function of the primary current.The secondary switch and time delay circuits may comprise self-powered modules which may be added to the primary circuits of existing X-ray generators without additional sensing or power supply connections.

Abstract: A deflection circuit has a switching transistor to switch current from a supply transistor through deflection coils. Both the base and collector current of the supply transistor are sensed to eliminate temperature variations in a linearity correction circuit. The deflection coils have series transformers coupled to them for individual linearity correction. This enables higher values of variable resistors to be used, thus eliminating contact potential problems.