Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5754462 | Microprocessor auxiliary with ability to be queried re power history A system which includes a microprocessor (or microcontroller) and an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor. The microprocessor can access the auxilary chip to ascertain the powe... | 05/19/1998 |
| 5473279 | Integrated compander amplifier circuit with digitally controlled gain An integrate circuit companding amplifier for analog signals with digitally controlled gain. The expansion amplifier uses a square law with presentation of sign and the compression amplifier uses the inverse (square root law with preservation of sign). A ... | 12/05/1995 |
| 5418936 | Double-buffered systems and methods A low-power timekeeping integrated circuit, using a double-buffered memory architecture: The user can freely read from user memory at any time, and an internal clock periodically updates a set of timekeeping registers. Transfer from the timekeeping regist... | 05/23/1995 |
| 5398326 | Method for data communication A system architecture which provides efficient data communication, over a one-wire bus, with a portable data module which does not necessarily include any accurate time delay circuit whatsoever. The time delay circuit in the module can be extremely crude.... | 03/14/1995 |
| 5388134 | Integrated circuit thermometer An integrated circuit temperature detector (thermometer) uses a temperature dependent oscillator to count up to a fixed number and thereby generate a time interval indicative of the temperature (a temperature-to-time converter). The time-to-number convert... | 02/07/1995 |
| 5381034 | SCSI terminator An integrated circuit terminator for a SCSI bus with resistors made of laser-blowable fuses in an array and a reference voltage source made with a bandgap generator and a two stage amplifier including a dummy isolation stage for providing symmetrical mism... | 01/10/1995 |
| 5381540 | Interface: interrupt masking with logical sum and product options Interrupt circuitry for a processor comprises a plurality of interrupt inputs, an interrupt output, combinatorial logic with a plurality of combinatorial logic inputs connected to the plurality of interrupt inputs and with a combinatorial logic output con... | 01/10/1995 |
| 5359233 | Reset monitor for detection of power failure and external reset Reset monitor for detection of power failure and external reset for devices such as microprocessors with the reset monitor providing a single settling time hold down of a reset signal. Preferred embodiments include bandgap reference with high current side... | 10/25/1994 |
| 5333295 | Memory control system Preferred embodiments have an external RAM controlled by logic on an internal RAM with overlapping address space. Read requests from addresses in the overlapping portion are directed to internal RAM only by controlling the output enable signal of external... | 07/26/1994 |
| 5327564 | Timed access system for protecting data in a central processing unit A system for protecting data in a CPU's internal register. To obtain write access to the protected register, a process must sequentially write first and second keywords to an access register, within a predetermined time window.... | 07/05/1994 |
| 5315549 | Memory controller for nonvolatile RAM operation, systems and methods A memory controller for supplying backup battery power when a main power supply voltage drops together with programmable plus power fail write protection. The controller includes supravoltage induced sleep mode operation, MOS switching between backup batt... | 05/24/1994 |
| 5306961 | Low-power integrated circuit with selectable battery modes An integrated circuit which can be operated EITHER in a battery-backed mode OR in a battery-operated mode. This is accomplished without any necessity for bond options, mask alteration, laser writing, or fuse blowing. The integrated circuit of the presentl... | 04/26/1994 |
| 5303390 | Microprocessor auxiliary with combined pin for reset output and pushbutton input A system which includes not only a microprocessor (or microcontroller), but also an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor, and also provides a watchdog function to monitor the m... | 04/12/1994 |
| 5299156 | Dual port static RAM with bidirectional shift capability A dual storage cell memory includes an array of dual storage cells, each of the dual storage cells containing a first memory cell and a second memory cell. The first and second memory cells are well known six-transistor static memory cells with the additi... | 03/29/1994 |
| 5297268 | ID protected memory with a readable/writable ID template A CPU (28) accesses remotely disposed RAM (12) through a common serial data link. The RAM is interfaced to the common data link under the control of an arbiter circuit (10). The arbiter includes a protocol shift register (31) for receiving control informa... | 03/22/1994 |
| 5297056 | Directly-writable digital potentiometer A digital potentiometer, in which the three terminals of the potentiometer are all free-floating. The position of the wiper is selected by a control signal received on a serial port. A change is made in the effective position of the wiper until the reset-... | 03/22/1994 |
| 5287018 | Dynamic PLA time circuit A dynamic PLA timing circuit in a PLA ROM includes a PLA line and the address section only of another PLA line. The address section of the first PLA line is connected to the true address lines and the address section of the other PLA line is connected to ... | 02/15/1994 |
| 5266887 | Bidirectional voltage to current converter A bidirectional voltage to current converter circuit with extended dynamic range includes a first and second operational amplifier in which the input voltage terminal is connected to the negative input of both operational amplifiers. The outputs of the op... | 11/30/1993 |
| 5267222 | Low power timekeeping system A low power timekeeping system utilizes a state machine to first read seconds stored in a RAM and update seconds and then determine if the minutes requires updating. If the minutes do not require updating then the sequencer stops operation until the next ... | 11/30/1993 |
| 5260612 | Bi-level dual mode transceiver A transceiver (100) for TTL and RS232 communication with automatic sensing (130) of the type of input and adjustment of the output to correspond together with current stealing (131) from the input communication lines to provide extreme voltages for transm... | 11/09/1993 |
| 5258721 | Ring signal detection circuit A telephone network interface integrated circuit with digitally based loop current detection and digitally based ring signal detection. The ring signal detection includes discrimination with a cutoff frequency of about 13 Hz to distinguish ring signals fr... | 11/02/1993 |
| 5249298 | Battery-initiated touch-sensitive power-up A power-switching device (such as a gate-controlled TRIAC) is used to connect and disconnect a computer system's power supply unit from the power-line connection. This power-switching device is controlled by a battery-powered circuit. The battery-powered ... | 09/28/1993 |
| 5243535 | Digital potentiometer with stackable configuration An integrated circuit containing two digital potentiometers with each potentiometer including a passive resistor string with tap points. Tap point selection is programmed through a three-wire serial port. An output multiplexing the selected tap points per... | 09/07/1993 |
| 5235548 | Memory with power supply intercept in redundancy logic A low-power SRAM with redundant rows in each of the subarrays. Conventional redundancy logic permits defective rows to be electrically replaced by redundant rows. In addition, power supply disconnect logic permits the VDD supply voltage line fo... | 08/10/1993 |
| 5226137 | Electronic key with multiple password protected sub-keys using address and translation to implement a block data move between public and protected sub-keys An electronic key integrated circuit which includes three independently addressable partitions of secure memory. Each of these three partitions can function as a separate "subkey." Each of the subkeys is independently password-protected. In addition to th... | 07/06/1993 |
| 5223748 | Battery manager Battery monitor (100) with a transient pull down (172) for backup batteries which is active during power up and prevents the feedthrough charging of low or dead batteries causing a spurious power fail indication.... | 06/29/1993 |
| 5218707 | Integrated circuit with remappable interrupt pins An integrated circuit wherein remapping logic permits the output-driver characteristics of a given pin to changed in software, by changing the data stored in a nonvolatile control bit.... | 06/08/1993 |
| 5218225 | Thin-film resistor layout A class of layout patterns for variable resistors and integrated circuits where the resistance is varied by varying a wiping point on a resistor line; contact is not made into the resistor line itself, but instead all contacts are made only to tabs which ... | 06/08/1993 |
| 5210846 | One-wire bus architecture A system architecture which provides efficient data communication, over a one-wire bus, with a portable data module which does not necessarily include any accurate time delay circuit whatsoever. The time delay circuit in the module can be extremely crude.... | 05/11/1993 |
| 5206905 | Password protected device using incorrect passwords as seed values for pseudo-random number generator for outputting random data to thwart unauthorized accesses An electronic key which includes a pseudo-random number generator. If the correct password is received, the contents of a secure memory will be outputted by the electronic key. However, if an incorrect password is received, that password will be used as a... | 04/27/1993 |
| 5203000 | Power-up reset conditioned on direction of voltage change A system which includes a microprocessor (or microcontroller) and an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor. In one mode of operation (for use with a low-power CMOS processor), t... | 04/13/1993 |
| 5200751 | Digital to analog converter using a programmable logic array A digital to analog converter, wherein a time/voltage array is programmable, to determine which of the possible reference voltages will be enabled by which of the control inputs. Anther set of programmable options, in an output connection matrix, determin... | 04/06/1993 |
| 5199263 | Combustion system with reduced sulfur oxide emissions A coal-fired power plant with a wet scrubber wherein sulfite or bisulfite ions are converted to sulfate ions by forced aeration in the scrubber reaction tank. Air bubbles are introduced at only a few points in the tank, but an impeller is used which conti... | 04/06/1993 |
| 5197142 | Memory arbitration between timekeeping circuitry and general purpose computer Arbitration logic is provided to receive conflicts between a timekeeping system and a user system which share a common memory. The common memory is comprised of an array of dual memory cells, each of which has a timekeeping cell and a user cell and circui... | 03/23/1993 |
| 5194761 | Waveshaping subsystem using converter and delay lines A waveform generating circuit, wherein a master clock signal is fed into a tapped string of adjustable delay lines, and the tapped delay outputs are used to control selection of scaled voltage fractions for output. The use of adjustable delay lines means ... | 03/16/1993 |
| 5191554 | Low-voltage low-power static RAM A low-power low-voltage CMOS six-transistor static random access memory (SRAM), which can operate on a power supply voltage which is less than the sum of the NMOS and PMOS threshold voltages, does not include any analog or metastable sense amplifier stage... | 03/02/1993 |
| 5189598 | Dual function microboard with a row of connectors on two edges An innovative microboard package, which includes not only a row of edge connector contacts along one long edge thereof, but also includes another row of edge connector contacts along the other long edge. The contacts are connected so that the functionalit... | 02/23/1993 |
| 5182810 | Isolation gates to permit selective power-downs within a closely-coupled multi-chip system A battery-backed ancillary power-management chip, in combination with a battery-backed microprocessor or microcontroller, permits a low-power system to achieve a zero-power standby mode with full nonvolatility. The ancillary chip contains transmission gat... | 01/26/1993 |
| 5181091 | Integrated circuit with improved protection against negative transients A battery-backed integrated circuit, with a double diode structure connected to signal lines. In the double diode structure, a first junction is three-dimensionally enclosed by a second junction, so that minority carriers generated at the first junction w... | 01/19/1993 |
| 5175845 | Integrated circuit with watchdog timer and sleep control logic which places IC and watchdog timer into sleep mode A system which includes a microprocessor (or microcontroller) and an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor, and also provides a watchdog function to monitor the microprocessor's... | 12/29/1992 |
