Abstract: An antenna apparatus includes: a parabolic reflector; a dielectric support pedestal; a sub-reflector connected to an upper part of the dielectric support pedestal; and a waveguide connected to a lower part of the dielectric support pedestal, wherein the parabolic reflector has a curved surface in which a ratio of a focal length to a diameter is greater than a preset value, and at least one corrugation configured to suppress a cross polarization is formed in a region of the dielectric support pedestal.

Abstract: An improved infrared absorbing ink for jet printing comprises an aqueous solution of CI solubilized Sulfur Black, a thiosulfonic acid of 2,4-dinitrophenol, 1 dye with polyethylenimine as a binder. The preferred weight ratio is about 5 parts dye to 1.5 parts binder. Excessive cross-linking of the dye and the binder is prevented by adding sodium carbonate or other disclosed alkaline reagents in sufficient amount to prevent the pH of the solution from dropping below about 8.5 during a period of time equal to the expected shelf life of the ink.The ink further comprises 4 to 10 percent by weight of a humectant to prevent water loss during use in a jet printer and 1 to 5 percent by weight of diethylene glycol to facilitate penetration of paper by the ink. The preferred embodiment also includes a bacteriacide/fungicide and a defoamer. The ink runs well in a multi jet printer, is waterproof when printed, smudge resistant and has a shelf life of over 11/2 years.

Abstract: An improved infrared absorptive jet printing ink is provided. The composition includes an aqueous solution of a mixture of infrared absorptive water soluble dyestuffs, an alkaline agent which completely solubilizes the dyestuffs in water and aids in their penetration of and fixation to paper, and a humectant to prevent the composition from drying out. Optional additives include a fiber fixing agent or a water repellent agent and a defoaming agent. The ink runs well in a multi-jet printer, is smudge resistant and waterproof when dry, has a high absorptivity at infrared wavelengths, and is optically black.

Abstract: A cleaning composition for use in removing ink residues, soil, dust, and other foreign matter from the orifices, fluid manifolds, and fluid lines in an ink jet recording apparatus is provided. The aqueous based composition includes a wetting agent, an electrostatic discharge agent, a fluid viscosity and density adjusting agent, and a pH adjusting agent. Optionally, a metal chelating agent may be included in the composition.

Abstract: An improved jet printing ink for use in jet drop printers and copiers is provided. The composition comprises an aqueous solution of a water soluble or solvent soluble dye, an organic chemical solvent comprising a glycol ether having 8 to 12 carbon atoms, a bridging agent for solubilizing the solvent and dye in solution comprising an ethoxylated higher alcohol amine-amide, a humectant, and a defoaming agent.The ink runs well in a multi-jet printer and will not dry out or clog printing head orifices even if left in the printing head for an extended period. The ink is fast drying on paper once printed and is smudge and light resistant.

Abstract: An aqueous jet printing ink composition which fluoresces under ultra violet radiation containing a water soluble fluorescent dye dissolved in the water base in an amount up to 2% by weight and a water soluble binder component dissolved in the water base in an amount to provide for a specific viscosity which does not exceed 20 centipoises and which preferably includes a fluorescent brightener alone or in combination with fluorescein or one of its salts.

Abstract: An ink composition for jet printing onto non-porous-non-absorbent surfaces based upon a ketone solvent having a soluble ionizable salt and a dyestuff and which may contain in addition water in an amount up to 10% by weight, a lower alcohol in an amount up to 8% by weight, a pyrrolidone in an amount up to 4% by weight, a carbitol in an amount up to 4% by weight and a vinyl acetate copolymer resinous binder in an amount up to 6% by weight, the jet printing ink composition having a viscosity within the range of 1.5 to 10 cps, a resistance less than 2000 ohm-cm, a surface tension less than 28 dyne/cm, a velocity of sound within the range of 1200-1700 m/sec, and an upper limit of 5 microns and preferably 2 microns insolubles.