31
Steven T Barrett, Kevin M Laird, Richard E Murray, James M O Connor: Dynamic encryption key selection for encrypted radio transmissions. Motorola, Daniel K Nichols, Pedro P Hernandez, June 22, 1993: US05222137 (141 worldwide citation)

A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with radio (100). Prior to transmitting an encrypted message, radio (100) selects a unique key identifier autom ...


32
Robert H Bass Sr, Bruce A Hardman, Sandra M Harper, Harry Pasterchick Jr, Miriam L Weisenbloom: Electrically isolated optical connector identification system. International Business Machines Corporation, Stephen T Keohane, June 22, 1993: US05222164 (140 worldwide citation)

A connector/cable identification system comprises a plug having an extension and a female housing having at least two pairs of optical emitter/sensors. Each emitter/sensor pair detects whether the extension is therebetween. Because different extensions have different lengths or aperture configuratio ...


33
Michael H McTeigue, Art Zias: Sports training system and method. June 22, 1993: US05221088 (138 worldwide citation)

A sports training aid has a pair of foot sensors, insertable in a pair of shoes, which generate measurement signals indicative of weight applied to each of the foot sensors. The training aid compares the measurement signals with a specified range of values and produces audible sounds indicative of t ...


34
J William Whikehart: Digital quadrature radio receiver with two-step processing. Ford Motor Company, Mark Mollon, Roger L May, June 22, 1993: US05222144 (132 worldwide citation)

A digital signal processing (DSP) radio receiver employs a conventional analog RF tuner to produce an analog intermediate frequency. The receiver performs DSP functions of digitally sampling the analog intermediate frequency at a sampling rate f.sub.s, concurrently mixing, filtering, and sample-rate ...


35
R David Farris: Surgical face mask support apparatus and method. John A Beehner, June 22, 1993: US05220699 (127 worldwide citation)

A facial support mask supports the face of a patient in the prone position during surgical procedures in spaced relation above a support surface and in a variety of selectively fixed positions relative to the torso and the support surface. The mask has a plurality of transversely spaced longitudinal ...


36
D Gregory Beckett: Method for forming laminate for microwave oven package. Beckett, Sim & McBurney, June 22, 1993: US05221419 (124 worldwide citation)

A laminate structure useful for incorporating into a package structure for the microwave cooking of foodstuffs for consumption comprises an outer layer polymeric material, an outer layer of microwave transparent material, a grid layer having an electroconductive surface surrounding transmissive aper ...


37
Hsuan Chang: Apparatus and method for stereotactic surgery. General Electric Company, Gene Bolmarcich, Paul R Webb II, June 22, 1993: US05221283 (123 worldwide citation)

The trajectory of a surgical instrument or tool used for a stereotactic medical procedure is controlled by a passive apparatus having two pivots into which the tool may be inserted. The pivots, which serve as end effectors, are placed at points along a selected trajectory. The pivots are mounted to ...


38
Loius D Fielder: Low time-delay transform coder, decoder, and encoder/decoder for high-quality audio. Dolby Laboratories Licensing Corporation, Thomas A Gallagher, David N Lathrop, June 22, 1993: US05222189 (123 worldwide citation)

A low bit-rate (192 kBits per second) transform encoder/decoder system (44.1 kHz or 48 kHz sampling rate) for high-quality music applications employs short time-domain sample blocks (128 samples/block) so that the system signal propagation delay is short enough for real-time aural feedback to a huma ...


39
Bob J Patton: System for controlled drilling of boreholes along planned profile. Patton Consulting, Pravel Gambrell Hewitt Kimball & Krieger, June 22, 1993: US05220963 (120 worldwide citation)

An improved method and apparatus for automatically controlling the direction of advance of a rotary drill to produce a borehole profile substantially as preplanned with minimal curvature while maintaining optimum drilling performance. The system is capable of storing a planned path for the borehole. ...


40
Craig E Caufield: Rapamycin esters. American Home Products Corporation, Arnold S Milowsky, June 22, 1993: US05221670 (118 worldwide citation)

A compound of the structure ##STR1## where R.sup.1, R.sup.2, and R.sup.3 are each, independently, hydrogen or ##STR2## with the proviso that R.sup.1, R.sup.2, and R.sup.3 are not all hydrogen; R.sup.4 is --(CH.sub.2).sub.m X(CH.sub.2).sub.n CO.sub.2 R.sup.5 or ##STR3## R.sup.5 and R.sup.6 are each, ...