51
Sandor Bela: Dual-action tailgate. General Motors Corporation, July 13, 1971: US3592504 (33 worldwide citation)

A dual-action tailgate for a conventional station wagon type vehicle is mounted on the vehicle body for swinging movement into and out of the rear opening thereof about a vertical axis as a door, or about a horizontal axis as a drop-gate, by a biaxial multihinge and by a pair of hinge-latches each o ...


52
Gibby Delbert F: Slide rule for computing musical relationships. July 13, 1971: US3592099 (33 worldwide citation)

A slide rule capable of computing through mathematical constants substantially all significant musical relationships as they apply to any given key including chord structure and interval patterns of major and relative minor diatonic scales. The slide rule comprises a plurality of slidable members on ...


53
Gouge Jr James Reid, Barron Robert L: Redundant, self-checking, self-organizing control system. Adaptronics, July 13, 1971: US3593307 (33 worldwide citation)

A self-organizing control system having a plurality of self-organizing controllers acting in parallel to provide actuation signals for plant control. The controllers are constantly monitored to locate faulty controllers. When one controller does not compare with the others, it is initially coerced t ...


54
Harris George A: Ultrasonic detector. July 13, 1971: US3592967 (33 worldwide citation)

This application discloses a detector for leaks which generate ultrasonic waves, such as illuminating gas leaks, and electrical leaks of the corona or arcing types. An ultrasonic detector is utilized to respond to the ultrasonic waves generated by the turbulence in the atmosphere caused by such leak ...


55
Takeda Chuji, Sawada Katsuo, Asanari Shigeyuki, Nakamura Tetsuya: Electrically operated vacuum cleaner equipped with automatic filter-cleaning means. Matsushita Electric Industrial, July 13, 1971: US3591888 (32 worldwide citation)

An electrically operated vacuum cleaner having automatic filter-cleaning means, said means comprising a filter-cleaning member adapted to be driven by the rotation of cord takeup means transmitted through power-transmitting means, the movement of the filter-cleaning member being utilized to apply de ...


56
Domshy Ernest H, Moller Victor: Starting and operating control for an AC motor powered by a DC power supply. North American Rockwell Corporation, July 13, 1971: US3593078 (32 worldwide citation)

An AC Motor Control, wherein the AC motor is powered by a DC power supply through a DC to AC converter circuit, and wherein the control has an AC current sensor for producing a current signal indicative of the current supplied to the motor which signal is coupled to the converter to prevent excessiv ...


57
Dunn James G, Krause Irving A, Fletcher Irving Lane, Allen Walter K, Miller John E: Satellite interlace synchronization system. July 13, 1971: US3593138 (32 worldwide citation)

A master station and a plurality of slave stations include synchronization equipment to enable each of the stations to have access to a common repeater in a different time slot of a time division multiplex format at the repeater, there being motion between the stations and the repeater. The master s ...


58
Johnson Bradford J: Dental floss dispenser. July 13, 1971: US3592203 (31 worldwide citation)

This invention relates to improvements in a device for dispensing dental floss from a source of supply such as a spool by a clutch member which cooperates with a drive means for unwinding and feeding the floss to an exposed position exteriorly of the housing preparatory for use, the clutch member ho ...


59
Rippon George Maxwell: Fluid circulator. July 13, 1971: US3592450 (31 worldwide citation)

A liquid-circulating device includes a vertical stack submerged in liquid and provided with a large bubble generator adjacent its bottom opening. The bubble generator comprises an open bottomed gas chamber and an inverted tubular siphon including a first vertical leg communicating with the upper par ...


60
Schneller George H, Levi Ralph S, Levin Howard J, Goodsir Stephen W: Universal dispensing device for intravenous medications. American Home Products Corporation, July 13, 1971: US3592245 (31 worldwide citation)

The disclosure is directed to a universal dispensing package for medicaments to be dissolved in a parenteral container prior to use. A container is provided with a cap which first, has a hollow piercing device for dispensing a contained medicament into a 'closed system' parenteral solution container ...



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