21
Edward D Geist, Arthur T Kimmel, Gregory G Schober, Trenton A Ames, David B Matthews, John W Clark: Disk drive insertion and removal interlock. Convex Computer Corporation, Richards Medlock & Andrews, December 31, 1991: US05077722 (134 worldwide citation)

An interlock for a disk drive unit having a handle and a camming arrangement responsive to pivotal movements for inserting and withdrawing the unit from a housing fixture. A solenoid is actuable to lock the handle when the unit is fully inserted. A sensor is adapted for sensing an interlock engageme ...


22
Kenneth W Krause: Microprocessor controlled arthroscopic surgical system. Dyonics, Kirkpatrick & Lockhart, December 31, 1991: US05077506 (132 worldwide citation)

An apparatus for controlling the speed of a plurality of DC motors, comprises a device for supplying voltage to one of the plurality of DC motors, first selector for selecting one of the DC motors to be connected to the device for supplying voltage, second selector for selecting a desired speed for ...


23
Renato M Openiano: Computer game controller with user-selectable actuation. William C Fuess, December 31, 1991: US05076584 (129 worldwide citation)

A controller electrically interfaced to a video game computer or the like for the purpose of controlling a progression of the video game or the like is selectively actuated by discrete motions and forces the locations, magnitudes, and orientations of which are variably predetermined by the user. Pre ...


24
Donald W Schoendorfer, William R Miller: Method and apparatus for determination of chemical species in body fluid. Sudor Partners, Knobbe Martens Olson & Bear, December 31, 1991: US05076273 (129 worldwide citation)

Disclosed is a method and apparatus for the non-invasive determination of one or more preselected analytes in a body fluid expressed through the skin. The fluid is collected in a dermal concentration patch and concentrated by driving off a portion of the substantial water fraction under the influenc ...


25
Kim C Hardee, David B Chapman, Juan Pineda: Dynamic random access memory. Motorola, James L Clingan, Ray Warren, December 31, 1991: US05077693 (129 worldwide citation)

A DRAM is operated based upon an external clock input, a column enable, and a row enable. The DRAM is accessed and row and column addresses are latched into buffers based upon the clock input.


26
Tomohisa Sakurai, Tetsumaru Kubota, Hitoshi Karasawa, Tatsuya Kubota, Yuichi Ikeda, Mitsumasa Okada, Toshihiko Suzuta, Hideo Nagazumi, Kazuya Hijii, Masahiro Kudo, Hiroaki Kagawa, Kenji Yoshino, Tadao Hagino: Ultrasound type treatment apparatus. Olympus Optical, Frishauf Holtz Goodman & Woodward, December 31, 1991: US05076276 (127 worldwide citation)

An ultrasound type treatment apparatus includes an ultrasonic oscillation device for outputting an ultrasonic oscillation wave, a drive circuit for driving the ultrasonic oscillation device, a probe connected to the ultrasonic oscillation device to transmit that ultrasonic oscillation wave to an aff ...


27
John R Howatt: Switching amplifier. Apogee Technology, Robert F O Connell, December 31, 1991: US05077539 (126 worldwide citation)

A switching amplifier system which in one embodiment includes switching circuitry responsive to a tri-state command signal for providing a power output from a power supply which has amplitude levels, time durations, and polarities corresponding to the tri-state command signal for supply to a load vi ...


28
Juan Grau Jr, Brian S Messenger: Radio communication system using spread spectrum techniques. Proxim, December 31, 1991: US05077753 (126 worldwide citation)

A spread spectrum radio communication system includes a generator for generating a pseudo-random chipping sequence, a frequency spreader for combining digital data with the pseudo-random chipping sequence to produce a spread spectrum signal, a modulator for modulating the spread spectrum signal for ...


29
Thomas V D Amico, Ronald E Sharp: Secure over-the-air registration of cordless telephones. Motorola, Michael J Buchenhorner, December 31, 1991: US05077790 (122 worldwide citation)

A method for registration of a portable unit that may be utilized in a communication system that comprises a network controller, having a data base for storing portable identification numbers, a base station, and a portable unit, wherein a subscriber communicates to the network controller a first in ...


30
Michael A Fischer, William M Cox: LAN with dynamically selectable multiple operational capabilities. Datapoint Corporation, John R Ley, December 31, 1991: US05077732 (121 worldwide citation)

Multiple different operational capabilities, such as data transfer rates or communication protocols, are selectable for use on a single LAN. Enchanced nodes of the LAN have the capability of utilizing either an enhanced capability or a common capability in communicating with other nodes. Those basic ...