Abstract: Methods and apparatus are provided for preventing ink clogging in impulse ink jet printers. In preferred embodiments, the ink jet printers include at least one nozzle for ejecting ink droplets in response to a sequence of control signals and a control means unit for generating and applying the sequence to the nozzle and for controlling the amplitude of the control signals. In preferred methods, the control unit generates a plurality of mutually asynchronous firing signals on demand, the firing signals having amplitudes which are effective to eject droplets of ink from the nozzle. The control unit also generates a plurality of mutually synchronous sub-firing signals after a predetermined interval following the firing signals, the sub-firing signals having amplitudes which are effective to prevent clogging of the nozzle yet which are ineffective to eject droplets of ink therefrom.

Abstract: Impulse-type ink jet ink compositions and processes for recording information therewith are provided. The ink compositions dry to the touch more rapidly than the impulse-type inks known in the art. The rapid-drying characteristics are believed to be attributable to their relatively low viscosities. The ink compositions preferably comprise from about 80 to about 99 percent by weight of a liquid vehicle which consists essentially of an organic solvent having a viscosity less than about 7.0 centipoise at 20.degree. C. and from about 1 to about 15 percent by weight of a colorant. The ink compositions are suitable for printing alphanumeric text or bar codes on highly calendared paper or other non-absorbent surfaces.

Abstract: Impulse-type ink jet ink compositions are provided along with processes for recording information therewith. The ink compositions preferably comprise from about 65 to about 80 percent by weight of a low molecular weight diol, from about 15 to about 25 percent by weight of a low molecular weight diol ether, and from about 1 to about 15 percent by weight of a colorant. The ink compositions are suitable for printing clear, well-defined alphanumeric text or bar codes on porous substrates such as kraft paper corrugated cardboard.

Abstract: A fitted bed sheet includes a full-width pocket at at least one end.

Abstract: An eyeshield for covering an eye that is being treated for some medical problem, so as to shield the eye until such time as it has healed. The eyeshield includes a substantially firm but bendable foraminous member having a concave interior surface that is adapted to be juxtaposed with the eye--to create a kind of shallow "vault" over the eye. The preferred material for the foraminous member is a sheet of 6061 aluminum alloy having a thickness of about 0.025 inch. The member has a peripheral edge or rim having the general shape of an ellipse, with a major axis of about 3 inches and a minor axis of about 2.4 inches. The eyeshield also includes a relatively thick but lightweight border that is permanently mounted around the rim in such a way as to completely envelop the same.

Abstract: A mouthguard that has a body having upper and lower troughs conforming generally to the upper and lower arches. Liners of impression material are disposed in the respective troughs for conformance to the actual impressions of the teeth of the arches. The body has an occlusal wall that contains a series of spaced-apart air/saliva ducts extending in a lingual/buccal sense to establish lingual/buccal fluid communication. The liners are mechanically interlocked to the mouthguard body by interlocking material that extend along the edges of the respective troughs and also by integral connections which extend through the occlusal wall between the two troughs in bridging portions of the occlusal wall that separate the air/saliva ducts.

Abstract: A landfill composition containing no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of the landfill composition containing an industrial waste product, placed in a 400 micron conical paint filter for five minutes, passes no water through the filter, is produced by admixing the industrial waste product with 5 to 80 weight percent, based on the total solids content of the industrial waste product, of finely grounded granulated blast furnace slag comprising 30-40 percent SiO.sub.2, 40-45 percent CaO, 10-20 percent Al.sub.2 O.sub.3, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe.sub.2 O.sub.3 and a trace of phosphorous, the finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm/g.

Abstract: Various embodiments of orthodontic arch wires are disclosed. These embodiments comprise a metal part and a plastic part arranged so that the metal part faces teeth of the arch while the plastic faces labially. The arch wire is formed by an extrusion process wherein wire is extruded to a desired cross sectional shape and plastic is then extruded onto the metal. Various embodiments are configured for different cross sectional features. By making the plastic of a coloration matching the individual's teeth, an aesthetic benefit is obtained.

Abstract: An anti-lock up improvement for a conventional revolver which comprises a cam follower lever cooperating with cam surfaces on the hand for insuring that during a manually controlled movement of the trigger through a second segment of its return stroke, following a manual hammer movement back into its battery position, the hand end will move into a position to engage the next ratchet tooth after the trigger has been engaged with the cylinder lock, so that the trigger can be manually moved into its rearward position from any position within the manually controlled second segment of the return stroke of the trigger, thus preventing the trigger from being locked against such movement as would be the case when the hand moves into a position to engage the next ratchet tooth before the trigger has been engaged with the cylinder lock, and the manual movement of the trigger toward its rearward position is commenced after the hand end has been moved into a position to engage the next ratchet tooth and before the trigge

Abstract: The solids content of toxic waste chromium ore waste and of certain types of mud or sludge dredged from salty or brackish water are combined together and stabilized in a hardened state by adding to the settled volume of the mixed materials about 5% to about 30% by weight of the solids of finely ground basic granulated blast furnace slag, with intimate mixing, and maintaining the mixture in a quiescent state to produce a sedentary mass having load supportive properties suitable as landfill and whose impermeability effectively prevents leaching of any chromium ore waste by contact with surface or ground water. In this process for producing a sedentary and essentially impermeable load bearing mass toxic hexavalent chromium in the chromium ore waste is reduced to less or non-toxic trivalent chromium.

Abstract: A process for making an electrosurgical pencil with rocker switch for holding and controlling a monopolar electrosurgical scalpel blade, wherein the rocker switch pivots on the exterior of the pencil body and is isolated from the interior of the body by a flexible waterproof seal. In the process for manufacturing the electrosurgical pencil, a cable portion having at least a common conductor, first signal conductor, and second signal conductor is selected, clips are attached to each end of the three conductors of the cable portion, and a spring contact and a clip attached to one end of the common conductor are installed in a pencil body portion so that a central portion of the spring contact is held adjacent a switch seat. Clips attached to the first and second signal conductors are then mounted within the body portion beneath opposite ends of the switch seal and spaced apart from the spring contact, and a second body portion is sealed to the first body portion to create a unitary electrosurgical pencil body.

Abstract: An earth leakage protection device comprises a core balance current sensing transformer 1 having a secondary winding 2 in which a fault signal is generated in response to leakage from AC supply lines forming primary windings of the transformer 1, an operational amplifier OA1 for amplifying the fault signal, a precision rectifier circuit 8 comprising a pair of operational amplifiers OA2 and OA3 for performing full wave rectification of the amplified fault signal, a delay circuit 9 in the form of a two stage RC network which delays the rectified signal according to an IDMT characteristic, and a trigger circuit 10 in which the delayed signal is compared with a preset reference signal by an operational amplifier OA4 to provide a control signal which actuates a sagety device in the AC supply lines via a relay 11 when the reference signal is exceeded.

Abstract: A simple, economical valve unit for dispensing liquids and the like includes a cylindrical bell with an inwardly directed conical surface at one end and an outwardly directed radial flange at its opposite end with a central aperture in the conical surface and an open-ended buoyancy cylinder having a conical crown terminating in a projecting shaft received in the bell so said shaft extends through the aperture, and a cap seal attached to the distal end of the shaft whereby when the cylinder moves out of said bell, the cap seal will contact the conical surface in a sealing relationship, and when the cylinder moves into the bell, its conical surface will sealingly close the central aperture. The buoyancy cylinder is longer in axial length than said bell, so its projecting end can be engaged by a cap placed on a bottle in which the unit is installed to axially force its conical crown into the central aperture to prevent leakage of the liquid contents during shipment of the bottle in which the unit is installed.

Abstract: A tethered naval mine adapted automatically to maintain a predetermined depth below the surface of a body of water despite changes in water level. Provision is made for safeguarding operating personnel prior to deployment of the mine and to cause self-destruction thereof upon expiration of a predetermined period. The mine arrangement is such as to effect detonation either upon contact with a craft or by disturbances produced by the wake of a vessel or by mine-sweeping apparatus.

Abstract: A clamp for holding a work piece in position in an anodizing bath which is constructed at least partially of material resistant to liquid contained in the anodizing bath.The clamp is made completely of a synthetic plastic material which is resistant to liquid contained in the anodizing bath. The clamp comprises a U-shaped frame with a manually operable screw threadedly attached to a first leg of the frame. Titanium contact tips are provided, respectively, on the second leg and on the end of the screw.