Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 4866261 | Data limiter having current controlled response time A data limiter in a paging receiver for converting an analog signal to a digital signal, the data limiter having a variable time constant. The data limiter includes an amplifying circuit and an integrating circuit. The amplifying circuit, being responsive... | 09/12/1989 |
| 4858798 | Carry case with quick release and self locating retainer apparatus A carry case for a portable hand held appliance such as a radio unit is disclosed which is constructed of a soft resilient shock absorbing material and includes a retainer bracket of semirigid material affixed to the interior back wall of the case. This b... | 08/22/1989 |
| 4853884 | Random number generator with digital feedback A zener diode random number generator circuit is described which produces a random binary number output having a statistical distribution exhibiting a controlled degree of randomness determined in response to an input control signal. A microprocessor feed... | 08/01/1989 |
| 4851966 | Method and apparatus of printed circuit board assembly with optimal placement of components Method and apparatus are disclosed for printed circuit board assembly wherein optimal placement of components are effected. Components, such as microminiature components, are placed, at least on the underside of the circuit board, whereby specially contou... | 07/25/1989 |
| 4852090 | TDMA communications system with adaptive equalization A method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system is disclosed. A transmitting station (100) formats one or more equalizer synchronization words with a first user's data word,... | 07/25/1989 |
| 4849765 | Low-profile, printed circuit board antenna A low-profile antenna for operating in the 800 to 900 mHz range and especially suited for use with portable, hand-held electronic apparatus. The antenna features printed circuit board construction for precision fabrication, broadband operations and enhanc... | 07/18/1989 |
| 4843343 | Enhanced Q current mode active filter A current mode active filter includes a differential amplifier, having two transistors, and a current mirror, having two transistors, connected into a feedback loop. The phase shift of the loop is controlled by one or two grounded capacitors and bias curr... | 06/27/1989 |
| 4838661 | Liquid crystal light emitting display system A liquid crystal light emitting display (LCLED) device having two modes of operation. In the first mode the LCLED device produces dark symbols on a light background. In the second mode the LCLED device emits light producing light symbols on a dark backgro... | 06/13/1989 |
| 4831624 | Error detection method for sub-band coding A method and apparatus is disclosed for improving the quality of speech samples communicated via sub-band coding utilizing adaptive bit allocation, by providing error detection only on the adaptive bit allocation information. A first error detection code,... | 05/16/1989 |
| 4829466 | Paging device with modifiable operational characteristics An battery powered, adaptive signal decoder is disclosed which is capable of processing detected encoded signals in accordance with a plurality of decoding schemes. The decoder has an equivalent microcomputer implementation. Energy conservation means oper... | 05/09/1989 |
| 4828153 | Detachable belt clip assembly A detachable low profile mounting clip arrangement suitable for use with a portable hand-held electronic apparatus such as a paging receiver, includes a housing having a slot. A base member has a hook attached to one end and a pair of apertures at the oth... | 05/09/1989 |
| 4825193 | Acknowledge back pager with adaptive variable transmitter output power An acknowledge back (ack-back) pager is provided for receiving paging signals from a central paging station. The central paging station transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the gro... | 04/25/1989 |
| 4823123 | Knowledge back pager with frequency control apparatus An acknowledge back (ack-back) pager is provide for use in a paging system which includes a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-ba... | 04/18/1989 |
| 4815980 | Combined chassis retention and electrical contact arrangement A spring clip arrangement is disclosed for a portable battery powered device which provides an efficient chassis retention feature for a slideably removable electrical chassis in unassociated housing. This retention is accomplished without machine screws ... | 03/28/1989 |
| 4817196 | Apparatus for tuning the antenna of a miniature personal communications device An antenna tuning arrangement is provided for a miniature personal communications device which is normally worn on the body. The device includes a wristband having an antenna and antenna tuning elements which are normally concealed, to allow the antenna t... | 03/28/1989 |
| 4814782 | Single turn ferrite rod antenna and method An antenna having provision for mounting to a printed circuit board and method for making the antenna is described. The antenna includes a generally elongate, magnetically permeable core having a major axis and an insulating substrate affixed along an axi... | 03/21/1989 |
| 4814776 | Optimally grounded small loop antenna A small closed loop antenna is formed by a flat metal member formed into a U-shape which also serves as the front, back and top surfaces, or parts thereof, of the housing for a portable communications receiver. Connected to the open (bottom) end of the ar... | 03/21/1989 |
| 4814763 | Paging terminal apparatus with page forwarding capability and methodology thereof Apparatus and method is disclosed for automatically, or by selective response, call forwarding a message to one or more system pagers which have an acknowledge back capability. In one embodiment, disclosed apparatus automatically forwards a message to ano... | 03/21/1989 |
| 4811404 | Noise suppression system An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The impro... | 03/07/1989 |
| 4811376 | Paging system using LPC speech encoding with an adaptive bit rate A paging system providing an LPC encoded speech output having an adaptive bit rate. The LPC bit rate is adaptively modified based on paging system airtime loading. Synthesizer circuitry in the paging receivers, together with a system signaling scheme is u... | 03/07/1989 |
| 4811379 | Speak back paging system A paging system is provided having page transmission means responsive to a message origination device for transmitting selective call paging signals and messages. A query signal is also transmitted a predetermined minimum time period from the correspondin... | 03/07/1989 |
| 4804954 | Battery saving method for portable communications receivers A system transmitting synchronization signals and coded message signals is described. In particular, coded synchronization signals are used to indicate the transmission of coded message signals or the absence of transmission of coded message signals follo... | 02/14/1989 |
| 4805193 | Protection of energy information in sub-band coding A digital communication system for transmission and reception of speech signals and utilizing sampling, filtering and sub-band coding techniques for reduction of the bit rate. The energy levels of each sub-band are determined with respect to the band havi... | 02/14/1989 |
| 4802638 | Cord stowage apparatus A cord stowage device is provided which includes a spool having a channel through which a cable slidably passes from one side of the spool to the other side of the spool. First and second cup-shaped members are attached to respective ends of the spool. Ea... | 02/07/1989 |
| 4803487 | Portable communications receiver with separate information presentation means A personal message receiving apparatus is described including a portable communications receiver, intended to be carried by the user, which receives, detects and stores messages transmitted on a first radio frequency communication channel. The stored mess... | 02/07/1989 |
| 4794392 | Vibrator alert device for a communication receiver An alerting device for a paging receiver for generating vibration motion in the paging receiver housing. The alerting means comprises an electric motor, an eccentric weight, and a linking means. The electric motor is activated in response to an alert sign... | 12/27/1988 |
| 4786902 | Control interface for combined watch and pager functions A wrist worn device includes a digital watch circuit and a receiver circuit which responds to coded message signals including selective call signalling and message information. An input steering circuit interfaces between the watch circuit and the receive... | 11/22/1988 |
| 4784615 | Direct contact flexible circuit interconnect system and method A flexible circuit interconnect system and method for providing direct electrical contact between a flexible circuit and a printed circuit board or an additional flex circuit is disclosed. In one embodiment, elastomeric material is located between the fle... | 11/15/1988 |
| 4775847 | Tunable resonant cavity filter structure with enhanced ground return A tunable resonant cavity filter structure is disclosed which includes an enhanced ground return internal to the cavity which effectively eliminates generation of deterioration wide band noise and optimizes unloaded Q as well as rending resonant frequency... | 10/04/1988 |
| 4775083 | Portable radio carrying case A carrying case for a portable radio is provided which includes an attachment structure for attaching the case to the radio user. The carrying case includes a two position sound deflector which, at the option of the user, is situated in a first position t... | 10/04/1988 |
| 4772887 | Individual simulcast station control decoder A paging simulcast station remote control system decoder. The paging system decoder responds to signals generated in accordance with a predetermined signalling scheme comprising a series of tones and timed pauses. The decoder is also responsive to user pr... | 09/20/1988 |
| 4771399 | Method and apparatus for programming memory through battery terminals A memory programming system which provides a method and apparatus for programming and reading an electronic device memory through its power source connections. Circuitry is provided for programming and reading internal EEPROM memory of a portable radio wi... | 09/13/1988 |
| 4769642 | Paging receiver with LPC speech synthesizer A paging receiver with an LPC speech synthesizer is described. The paging receiver of the present invention includes a controller and decoder, and a microprocessor controlled speech synthesizer both coupled to a dual port memory. Digitally encoded voice m... | 09/06/1988 |
| 4761582 | Dual mode transducer An electroacoustic transducer such as a piezoelectric element transducer includes an output mode for generating an alert signal and an input mode for generating a switching signal. The transducer comprises an actuating means, such as a pushbutton, a resil... | 08/02/1988 |
| 4758928 | Mechanical interlock arrangement for preventing misinstallation of PC boards in an associated mainframe chassis A mechanical interlock arrangement is disclosed for preventing misinstallation of a plurality of associated PC boards in the mainframe chassis of an electrical or electronic apparatus. Each PC board is mounted to a subpanel which has a mounting flange wit... | 07/19/1988 |
| 4758833 | Paging universal remote control decoder A paging station remote control system decoder is described. The paging system decoder is responsive to signals generated in accordance to a signalling scheme comprising a series of tones and timed pauses generated by a paging system encoder. The paging s... | 07/19/1988 |
| 4749991 | Turn off protection circuit In system capable of self turn-off, a circuit arrangement for providing a controlled turn-off includes a detecting circuit for detecting actuation of a turn-off switch, thereby providing a turn-off authorization signal. A turn-off protection circuit is co... | 06/07/1988 |
| 4743881 | Ceramic temperature sensor A device for monitoring temperature as a function of electrical resistivity comprises a sensing element formed of a ceramic including lanthanum chromite with a dopant selected from magnesium oxide, aluminum oxide, titanium oxide, tin oxide and silicon oxi... | 05/10/1988 |
| 4737976 | Hands-free control system for a radiotelephone An improved hands-free user-interactive control and dialing system is disclosed for use with a speech communications device. The control system (400) includes a dynamic noise suppressor (410), a speech recognizer (420) for implementing voice-control, a de... | 04/12/1988 |
| 4727583 | Telephone transducer with improved frequency response An audio arrangement includes a thin speaker/transducer positioned within a portable housing wherein the speaker cavity is dimensioned to move the resonant frequency of the speaker/housing combination up to approximately the free-air cutoff frequency of t... | 02/23/1988 |
