Abstract: At the sending end, a plurality of high-frequency oscillators each furnish a signal having a frequency different from the frequency of the other of the oscillators. Timing signals derived from the television signal and signals from a random pulse generator are combined to furnish enabling signals for enabling the high-frequency oscillators during predetermined time intervals of the television signal and in a random order. A logic circuit which includes externally operable switches for setting up a program code assignment receives the enabling signals and furnishes an encoder control signal only in response to certain selected enabling signals. The encoder control signal changes the polarity of the picture signals relative to the synchronizing signals in the television signal. A mixer mixes the oscillator signals into the encoded television signal.

Abstract: A predetermined pattern of code signals is periodically inserted into the transmitted encoded television signal. The pattern is so chosen that a bistable circuit at the receiver changes state for each received signal. A counter counts the number of state changes and, if correct, a validation signal is furnished. The validation signal allows recording of the billing charge for the program and transmission of the decoded signal to the television receiver.

Abstract: Due to unavoidable timing and slope errors in the leading and trailing edges of invert pulses utilized in encoding and decoding of the television signal by inversion of the picture signal portion relative to the synchronizing signal portion, transients are generated. A clamping circuit clamps the television signal to a predetermined reference level for short time intervals around each desired switching time instant. The time intervals are sufficiently long to include the maximum possible variation in the actual timing of the switching time instants. A grey level is thus inserted at the encoder. At the decoder, a clamping circuit clamps the television signal to ground potential during the grey level intervals thereby balancing the DC components of the signal portions.

Abstract: A memory write-in control system provides for each dot a plurality of color designating bits representing color information for the dot as well as a set of mask command bits corresponding to the respective color designating bits. The memory content is changed in accordance with the color designating bits only when the mask command bits are at one logic level. The memory bit content is unchanged when the mask command bits are at the other logic level irrespective of the color designating bits.

Abstract: A method and apparatus for making monocolor prints in a desired color wherein a web of photoconductive material is supplied as a photosensitive material, a desired length of segment is sheared from said web of photoconductive material, said material segment is electrically charged, the charged material is exposed by a phototypesetting machine to light through desired characters, numerals and/or other symbols in an original plate of said machine, and said exposed material is developed by the use of electrophotographic toner having a desired color.

Abstract: A forming tool comprising a relatively rigid shank portion or holder mounting in bearing relation thereto and for limited rotation thereon an operating head. In the preferred embodiment illustrated the operating head is in the nature of a generally cylindrical body having a V-shaped notch. The formation of the notch in the cylindrical body produces thereon a pair of laterally spaced bearing surfaces for application to material to be worked, one of which functions as a fixing means and the other of which functions as a bending means.

Abstract: A field standard test weight having a density of between 7 and 9 grams per cubic centimeter and including a steel shell forming a durable enclosure, with the shell being filled with a mixture of lead slag, metallic lead, and lead oxide to achieve the overall density required, with various configurations being made possible because of the overall design characteristics. The test weight may also be provided with a weight adjusting cavity for receiving a charge of metallic lead therewithin in order to achieve the tolerances required for field standard test weights.

Abstract: A locking device adapted to lock a driven member automatically against the force which applies thereon comprising a locking plate which has an arbitrary length and locking flanks on both sides thereof; a locking member which has contact members with which locking flanks of the locking plate contact and pins; a drive plate which has contact sides, formed at about right angles to the longitudinal axis of the locking plate, with which the pins are in contact and a drive member thereon; and an operating plate which has a first sliding flank approximately paralleled to the longitudinal axis of the locking plate, along which one of pins of the locking member slides and a second sliding flank inclined to the first sliding flank along which another pin of the locking member slides. The contact members are generally pressed against the locking flanks of the locking plate by a suitable resilient.

Abstract: A method of cooking foods in vacuum packages, in which the food is encased in a plastic pouch, the pouch is evacuated of air and sealed under high vacuum, the package is immersed in a thermostatically controlled hot water bath to cook the food, then quick chilled and stored at 28.degree.-32.degree.F.

Abstract: A dredging apparatus having an improved dredging head in which the suction pump and drive motors for the same are mounted adjacent the clean-out and cutting augers for increased pumping efficiency. The augers include a cooperating plurality of cutting teeth mounted peripherally on the flighting of the auger and extending spirally along the same to provide for a continual shearing cutting surface in a line parallel to the rotational shaft of the augers for more efficient cutting of the fibrous materials.

Abstract: Pipe leak method and apparatus are provided in which the apparatus includes a pair of inflatable sleeves having each end of each sleeve sealed and connected by a flexible connection in spaced relationship to each other. One sleeve has a fluid connection for directing air thereinto for inflating the sleeve and a connection between the sleeves allows both sleeves to be inflated simultaneously from a remote location. A chemical line is connected through one sleeve to a space between the sleeves for directing several chemicals into the space when the sleeves are inflated in a pipe to seal a leak in the pipe between the inflated sleeves. The method has a TV camera located in a sewer line adjacent to a connection with a second sewer line so that the operator can remotely view the intersection to determine if fluids infiltrating the second line are flowing into the intersection.

Abstract: A packer apparatus for the internal sealing of pipe leaks having a cylindrical structure and a single sleeve located on the exterior of the cylinder. The single sleeve has a pair of inflatable chambers connected together in spaced relationship to each other and air hoses connect through the cylinder to each of the inflatable chambers for inflating and deflating the chambers remotely with air pressure. Chemical lines are connected through the cylinder and through the sleeve between the inflatable chambers. The cylindrical structure is made of two or more segments and is collapsible for reducing the size of the packer. The single sleeve is made of rubber reinforced with tire chord and is held to the cylinder only by the connections with the chemical and air lines.