An article theft detection system for identifying which of two adjacent passageways a protected article passes. Each passageway is provided with spaced apart interrogation and receiver antennas, but a single receiver antenna services both passageways. Multiplexing is used to energize the interrogation antennas in alternate sequence. The single receiver antenna is connected to a single receiver whose output is connected through switches, synchronized with the interrogation multiplexing, to separa...

Improved flooding of subterranean reservoirs with an aqueous biopolymer solution is accomplished by incorporating 10-2,000 ppm of a polyalkylene oxide polymer in the front portion, e.g. up to 20 percent of the solution. Without the polyalkylene oxide polymer, the solution exhibits a decrease in viscosity upon increase in shear rate providing unfavorable mobility control. By incorporating polyalkylene oxide polymer, the solution "thickens" on increased shear rates. This combination provides good ...

An adjacent channel rejector for use in communication systems such as TACAN includes a high gain amplifier adapted to be driven into saturation in response to signals in the channel, a wide band filter/demodulator connected to the high gain amplifier and a narrow band filter/demodulator connected to the amplifier. The rejector further includes an amplitude comparator coupled to these filters/demodulators for determining when a desired signal is in the channel thereby providing adjacent channel r...

A high density charge coupled device imaging array 28 with a bilinear array 30, 32 of photosites on a single integrated circuit chip is utilized in an image scanning configuration. Offset photosites 30a, 32a in two rows are coupled via transfer gates 36 to storage register 38 and then to shift register 44, and via transfer gates 34 to shift register 42. The output of these two shift registers 42, 44 are multiplexed to generate a single output pulse train representative of the information scanned...

A replaceable stabilizer comprises a steel sleeve with fixed blades adapted to be installed over the reduced lower box end of tubular rotary drill steel member prior to insertion of the taper threaded pin of a drill bit into the taper threaded drill steel box. The drill steel member may be a special sub or a regular length of drill steel with modified lower end. An internal straight thread at the upper end of the sleeve screws onto an external straight thread on the drill steel box. An annular r...

An encoder circuit converts a thermometer code into an equivalent adjacent binary code wherein only a single bit is changed to minimally increment or decrement the value of the binary code. The encoder logic is grouped so that the state of any single bit of the thermometer code can affect the state of one and only one bit of the binary code whereby when any least significant thermometer code bit is at an invalid logic level, the invalid level is propagated through the encoder circuit to only a s...

A system for allowing the intelligible reception of a selected CATV channel at the subscriber's TV set and for jamming the CATV channels adjacent to the selected channel so that the subscriber cannot intelligibly receive the adjacent channels by adjusting the fine tuning control on his TV set. In one embodiment, the output signal of a first oscillator which sweeps from 3 to 9 megahertz is heterodyned in a double balanced mixer with the output signal of a second oscillator which is tuned to the c...

An arrangement for temporarily sealing the space between two substantially parallel, adjacent plates in which a flexible, partially inflatable seal is located between the plates to effect primary and secondary sealing interfaces along the upper and lower edges of the plates, respectively. The seal has a wedged-shaped upper portion, a tubular lower portion and a substantially solid intermediate shank. The tubular end of the seal is inflated so that it expands into contact with the lower edges of ...

An impure liquid is continuously distilled in a deaerated conduit arranged in a coil to present adjacent loops in heat exchange relationship. The conduit is divided by a partial partition into a distilland trough and a distillate trough, the latter being on the outside of each loop. The impure liquid is introduced into the distilland trough for flow therealong and vaporization, and the resultant vapor crosses over to the distillate trough due to centrifugal force and condensation within the dist...

A wiper for simultaneously wiping two adjacent circular surfaces, has a shaft spaced from a plane passing through the axes of the two surfaces. The shaft is parallel to the plane and supports a bell crank whose two levers form an angle of less than 180.degree. with each other and which constitute two wiper arms to which wiper blades are connected. An oscillatory drive means rotates the shaft between two angular end positions to sweep the surfaces which are simultaneously wiped by the wiper blade...