Abstract: Applicants' invention is a product that is biocompatible and antimicrobial. According to Applicants' invention, a monomeric quaternary ammonium salt in a solvent is exposed to a polymeric substrate. The quaternary salt in solvent is absorbed by the polymeric substrate and the quaternary salt is polymerized thereby creating a product having quaternary salts impregnated on its surface. The polymerized material also penetrates the surface to some depth forming an interpenetrating network.

Abstract: Applicants' invention is a method for creating an interpenetrating network on the surface of devices and supplies that is biocompatible and antimicrobial. According to Applicants' invention, a polymerizable or monomeric quaternary ammonium salt in a solvent is exposed to a polymeric substrate. The quaternary salt in solvent is absorbed by the polymeric substrate and the quaternary salt is polymerized such that an interpenetrating network is formed with said polymeric substrate.

Abstract: A method and apparatus are shown for generating and transmitting very short and widely separated high frequency sine-wave pulses of electromagnetic energy into space. A transistor, a charging capacitor, and an inductor are coupled into a first series loop path to form a discharge circuit. A bias voltage source, the same charging capacitor, and a charging resistor are coupled into a second series loop path to form a recharging circuit. The bias voltage source is selected to be capable of biasing the forward conduction path of the transistor near its breakdown condition. An original information signal is sampled upon each occurrence of a periodic reference signal, and the transistor is then triggered into its breakdown or avalanche mode. The starting times of successive transmitted pulses are modified in accordance with a pulse position modulation protocol.

Abstract: A method and apparatus for molding articles such as ophthalmic devices to provide high surface smoothness without the formation of flock anywhere on the molded articles. A predetermined quantity of moldable material is arranged between spaced apart molding surfaces between which as an outer boundary a meniscus is formed. The configuration of the meniscus is controlled as by moving the molding surfaces toward each other to produce convex rounding of the moldable material forming the meniscus. Heating of the molds is controlled to accelerate the polymerization of the moldable material. The molding surface are moved when the moldable material attains a predetermined gel state.

Abstract: There is provided an analog-to-digital conversion technique that utilizes a sample and hold circuit for each bit try stage whereby after the most significant bit try, the remainder is sampled and held by the succeeding stage as an unknown input voltage for comparison with its respective reference voltage representing its corresponding bit weight. Thus, remainders for each bit weight comparison are successively passed from the most significant bit to the least significant bit as input voltages to the next bit try stage. The previous bit stage takes a new sample input voltage and starts another conversion at the next clock pulse. After the first full digital output of the initial conversion, a new digital output word of the successive sampled signal voltage is available after each clock pulse.