Information-storing devices, such as read-only-memories, comprise an array of semiconductor components on a substrate, each component being connected into the array by a fusible element. To disconnect selected ones of the components from the array, to store information, two sources of heat are applied to the fusible elements connected to the selected components to open-circuit the elements. One of the sources comprises the passage of current through the selected elements. The other comprises a g...

A filamentary electrode of the coiled coil loose fitting overwind type for low pressure discharge lamps. The fine overwind is coiled in oversized primary turns around the permanent primary mandrel wire which in turn is coiled into non-circular, suitably oval or egg-shaped secondary turns. The overwind is thereby prevented from unscrewing from the primary mandrel wire and the need for crimping, flattening or welding the ends of the coil prior to dissolving out the temporary mandrel wires used in ...

Polytetrafluoroethylene (ptfe) is fabricated into shaped products with the use of hexafluorobenzene as a plasticizer. The ptfe may be particulate, and may be fabricated by ram extrusion. From 8 to 16 percent by volume of the hexafluorobenzene is mixed with the ptfe and maintained in contact with it for long enough to be absorbed onto and just into the surface of the ptfe.

This specification discloses a method of applying first and second phosphor particles to a display screen wherein first phosphor particles are smaller in diameter than the second phosphor particles characterized by the steps of: A. immersing a transparent screen in water, B. suspending the first and second phosphor particles in the water, C. adding a silicate to the water, and effecting a pH in the range of 7-8 to form gelatinous silicic acid and envelope the larger phosphor particles with the g...

In the fabrication of sheet metal devices, particularly electrical components, a bracket has a main body portion from which a pair of legs extend. The pair of legs extend through slots in a housing and are deformed to rigidly secure the bracket to the housing. Notches in opposite sides of each leg limit the deformation so the deformation does not extend to the body portion.

An assemblage for lacquering metallized boards provided with metallized holes therethrough, wherein, in a dustproof enclosure each board is first dehydrated by heating, lowered vertically into a tank of lacquer, moved through the lacquer in a direction perpendicular to the plane of the board, raised vertically from the tank, and passed through a drying chamber. Said drying chamber includes a lacquer setting chamber having a hot air feed therein and surmounted thereon a drying passageway includin...

Methods and apparatus for fabricating refractive blazed holograms having high single image diffraction efficiencies. A reflective blazed hologram made with a single wavelength light source may be modified for high blazed efficiencies at any desired wavelength. A reflective blazed hologram surface is replicated onto the surface of a material of higher refractive index, with a shorter wavelength of light utilized fore reconstruction. A further embodiment is to replicate a reflective blazed hologra...

A germanium mesa transistor is fabricated having an epitaxially grown base region and an aluminum alloy emitter in the epitaxially grown layer spaced from the collector junction, and having a gold-comprising base electrode surrounding the emitter and closely spaced therefrom. The gold contact is formed by photolithographic and selective etching techniques, followed by the formation of the aluminum emitter, which is also formed by photolithographic and selective etching techniques. A key step is ...

A printed circuit is produced upon a structure including at least one sheet of metal bonded to a sheet of thermoplastic material by shearing off and displacing into the thermoplastic material that portion of the metal sheet which does not constitute part of the printed circuit pattern, thereby leaving on the surface of the thermoplastic material that portion of the metal sheet which constitutes the printed circuit.

Electronic circuits are fabricated on circuit boards of the type on which components are mounted with leads extending generally perpendicular to and away from the board. The leads are latched under projections extending from pairs of pins. This positively locks the components in place during dip soldering. Each pin is an elongated one-piece thin metal sheet member having tabs extending from the terminal portion. The member is formed into a U-shape so that the tabs extend from the pin to form the...