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Schwartz Robert C: Illuminated balloon. July 13, 1971: US3592157 (39 worldwide citation)

An illuminated balloon adapted to function as a signal beacon or as a display device, the balloon being constituted by an inflatable bag of translucent material having a spout. Inserted in the spout to hermetically seal the bag is a stopper having a self-sealing plug portion to receive a hypodermic ...


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Cohen Milton J: Catheter. July 13, 1971: US3592197 (37 worldwide citation)

This application discloses a catheter which comprises a hollow tube having a plurality of extensions at one end which are normally urged, by springs or other force exerting means, outwardly of the tube so that after the catheter has passed through a body passage or canal, with the end carrying the e ...


44
Freeny Stanley L, King Bernard G, Pedersen Thomas J: Digital transmission system employing band limited analog medium with adaptive equalizer at transmitter. Bell Telephone Laboratories Incorporated, July 13, 1971: US3593142 (36 worldwide citation)

A transmission system for transmitting multilevel digital signals over an analog band limited transmission medium. The digital signals to be transmitted are predistorted by a transversal preequalizer located at the transmitter which operates under the control of equalizer correction signals derived ...


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White James E: Acoustic logging tool having opposed transducers. Marathon Oil Company, July 13, 1971: US3593255 (36 worldwide citation)

A logging tool having opposed paired transducers located on opposite sides of the borehole in both the source and the detector and methods for its use. One source transducer expands while the opposed transducer contracts and one detector transducer emits a positive electrical signal in response to i ...


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Smith John I: Microwave quadrature coupler having lumped-element capacitors. Bell Telephone Laboratories Incorporated, July 13, 1971: US3593208 (36 worldwide citation)

A microwave quadrature coupler constructed of a plurality of thin conductive strips on a substrate, preferably formed by photolithographic means. Each of these strips comprises a section of transmission line having a physical length less than one-quarter wavelength at the midband frequency. The ends ...


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Derwin Louis A: Tool handle structure. July 13, 1971: US3592086 (36 worldwide citation)

A tool handle for an L-shaped Allan Wrench or the like comprising a tubular structure for receiving one leg of the wrench and having an opening intermediate its ends for passing the other leg of the wrench therethrough. Several embodiments comprise a tubular structure which has upper and lower inter ...


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Sandor Bela: Dual-action tailgate. General Motors Corporation, July 13, 1971: US3592504 (34 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 ...


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Kweller Esher R, Rosenberg Robert B, Staats William R: Gas burner device. Institute of Gas Technology, July 13, 1971: US3592180 (34 worldwide citation)

A gas burner for heating a pot or pan for use on a gas range top. The burner includes a planar portion and a recessed portion which is unitary with the planar portion. A chamber is provided below the recessed portion and passage means extend from the chamber and pass outwardly through the recessed p ...


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Schmitt Walter, Schuttler Wilhelm: Apparatus for replacing cores and severing webs in high-speed multiple winding machines. Maschinenfabrik Stahlkontor Weser Lenze KG, July 13, 1971: US3592403 (34 worldwide citation)

In a multiple-winding machine with continuously advanced web material, an empty core is positioned upstream of the almost-completed core and held against the running web by axially grasping winding shafts and by rolls forming a three-point support. A self-aligning knife transversally severs the web ...