Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| RE43236 | Automatic circuit and method for temperature compensation of oscillator frequency variation over temperature for a real time clock chip An automatic temperature compensated real-time clock (RTC) chip includes a clock portion having a crystal oscillator block including crystal compensation circuitry adapted to be coupled to a crystal. The crystal compensation circuitry includes a non-linear capacitor... | 03/13/2012 |
| 7371005 | Automatic circuit and method for temperature compensation of oscillator frequency variation over temperature for a real time clock chip An automatic temperature compensated real-time clock (RTC) chip includes a clock portion having a crystal oscillator block including crystal compensation circuitry adapted to be coupled to a crystal. The crystal compensation circuitry includes a non-linear capacitor... | 05/13/2008 |
| 7349507 | Extending PPM tolerance using a tracking data recovery algorithm in a data recovery circuit A circuit comprising a sampling logic to sample an incoming signal. A phase detection logic to determine a phase error associated with the sample of the incoming signal and to output an out-of-phase detection signal based on the phase error. A control logic coupled ... | 03/25/2008 |
| 7340366 | Method and apparatus of temperature compensation for integrated circuit chip using on-chip sensor and computation means A method and apparatus of temperature compensation for an integrated circuit using on-chip circuits, sensors, and an algorithm. The chip includes an on-chip reference circuit, an on-chip sensor measuring a parameter relative to the reference, and an on-chip computat... | 03/04/2008 |
| 7284141 | Method of and apparatus for measuring jitter and generating an eye diagram of a high speed data signal A sampling system is disclosed which measures high speed data signals by performing sampling events at intervals determined by a programmable DDS output frequency and a programmable counter. The reference frequency of the DDS is that of a clock signal that is synchr... | 10/16/2007 |
| 7283428 | Step motor drive unit and analog electronic timepiece To make it possible by a simple constitution to perform a forcible rotation drive by a correction drive pulse and obtain a demagnetization effect. In a case where a control circuit has judged on the basis of a detection signal from a rotation detection circuit 10... | 10/16/2007 |
| 7246022 | Initiation of differential link retraining upon temperature excursion A method includes detecting a change in temperature in an integrated circuit that is coupled to a differential communication link, and responding to the detected change in temperature by initiating a retraining process for the differential communication link. ... | 07/17/2007 |
| 7118269 | Method of correcting a real-time clock of an electronic apparatus A method of correcting a real-time clock of an electronic apparatus, notably a mobile telephone, in which the real-time clock operates with a first clock generator which generates a real-time clock while the electronic apparatus operates with a second clock generato... | 10/10/2006 |
| 7116182 | Method and system for downhole clock having compensation A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature sensing device and a heating device, where the predetermined temperature co... | 10/03/2006 |
| 7106127 | Temperature sensor and method for detecting trip temperature of a temperature sensor A comparator circuit of a temperature sensor includes an output node and a variable current node. The output node is a first voltage at a given temperature when a current at the variable current node is less than a threshold current, and a different second voltage a... | 09/12/2006 |
| 7107178 | Temperature sensing circuit for use in semiconductor integrated circuit A temperature sensing circuit has numerous trip points in conformity with a temperature change without adding decrease resistance branches, so as to obtain a fine control based on the temperature change. Accordingly, when employed in a semiconductor memory device, t... | 09/12/2006 |
| 7042299 | Crystal oscillation circuit A crystal oscillation circuit has a reduced circuit area and enables to stably oscillate at low consumed current. The crystal oscillation circuit includes an oscillating amplifier and a constant voltage generator. The oscillating amplifier excites a resonator compos... | 05/09/2006 |
| 6969891 | Device providing protection against electrostatic discharges for microelectronic components on a SOI-type substrate A device for the protection of an electronic component against electrostatic discharges. The device is made in a semiconducting layer of a substrate. The semiconducting layer covers an insulating layer. The device is connected to a contact pin to protect the electri... | 11/29/2005 |
| 6961287 | Time error compensating apparatus and method in a terminal A time-error-compensating apparatus and method corrects errors in a real-time clock caused by temperature fluctuations or other external influences. The apparatus includes a frequency counting unit which counts a high-frequency clock signal and a low-frequency clock... | 11/01/2005 |
| 6946813 | Step motor control device and electronic timepiece equipped with step motor control device A step motor control device detects a rotational driving state of a step motor. In a first detection period immediately after termination of the rotational driving state of the step motor, selected switch elements are controlled so that a first detection signal is o... | 09/20/2005 |
| 6914407 | Step motor control device and electronic timepiece equipped with step motor control device A control device detects a rotational driving state of a step motor having a coil. First and second switch elements are connected to each other in series, and a node of the first and second switch elements are connected to one side of the coil during use of the cont... | 07/05/2005 |
| 6729755 | Low power, cost effective, temperature compensated real time clock and method of clocking systems A temperature compensated clock and method of clocking systems are provided. The clock preferably has an oscillator for generating an oscillating waveform signal at a preselected frequency and a frequency divider responsive to the oscillator for dividing the frequen... | 05/04/2004 |
| 6616328 | High accuracy timepiece Accuracy adjustment apparatus for a timepiece has an accuracy adjustment data input control section including a case-mounted switch such as a crown of the timepiece. A crown state detection signal is used to determine the state of the crown. When an accur... | 09/09/2003 |
| 6529447 | Compensation of crystal start up for accurate time measurement An apparatus comprising a first circuit and a timing circuit. The first circuit may be configured to generate an output clock signal that may compensate for oscillation build-up and stabilization time after a power up. The timer circuit may be configured ... | 03/04/2003 |
| 6381702 | Electronic clock A highly accurate electronic timepiece is provided in which the operation of a logical slowdown/speedup circuit for adjusting accuracy is controlled by a CPU. The output of an oscillation circuit is input to a system clock generation circuit which generat... | 04/30/2002 |
| 6312153 | Clock or watch having accuracy-improving function A register having a predetermined set value is provided in parallel with a counter for counting a basic signal generated from a crystal oscillator. The register and the counter are connected to a comparator for inputting a count signal into a time-countin... | 11/06/2001 |
| 6217213 | Temperature sensing systems and methods A temperature-controlled counter/clock arrangement is provided where th rate or frequency of the counting is temperature dependent. This allows for a measuring of thermal accumulation and/or history. The temperature sensing is based upon the use of the va... | 04/17/2001 |
| 6176611 | System and method for reducing power consumption in waiting mode A timer for measuring a time period including a high frequency generating unit, a low frequency generating unit and a controller connected to the high and low frequency generating units, wherein the controller deactivates the high frequency generating uni... | 01/23/2001 |
| 6163126 | Electronic device In an electronic apparatus such as a timing device capable of a quick-moving operation, a detecting coil wound coaxially with a driving coil for driving a rotor is arranged, a feedback-induced voltage appearing in the detecting coil is detected by a detec... | 12/19/2000 |
| 6146011 | Self-correcting watch To provide a self-correcting watch wherein a high precision self-correction of the watch circuit can be realized without any troublesome operation, a self-correcting watch of the invention having a zero second set button comprises: a time interval counter... | 11/14/2000 |
| 6086244 | Low power, cost effective, temperature compensated, real time clock and method of clocking systems A temperature compensated clock and method of clocking systems are provided. The clock preferably has an oscillator for generating an oscillating waveform signal at a preselected frequency and a frequency divider responsive to the oscillator for dividing ... | 07/11/2000 |
| 6019500 | Method and apparatus for measuring cumulative time An apparatus for measuring cumulative time of operation time of an electrical equipment is comprised of a CPU having a nonvolatile memory and a RAM. This apparatus executes the following steps: (1) reading cumulative time data Ts of the nonvolatile memory... | 02/01/2000 |
| 5936149 | Personal date/time notary device A personal data/time notary device is embodied in a token device such as a "smart card". The portable notary device includes an input/output (I/O) port, which is coupled to a single integrated circuit chip. The I/O port may be coupled to a conventional sm... | 08/10/1999 |
| 5903523 | Time analyzer having an improved interpolator with temperature compensation A time analyzer having an improved interpolator with temperature compensation. The time analyzer of the present invention can be operated in a wide range of temperatures without need of recalibration in the field. The device includes hardware for making a... | 05/11/1999 |
| 5767747 | Electronic low power clock circuit and method A relatively low frequency oscillator in junction with a much higher frequency oscillator is used to produce a clock that is both accurate and minimizes power consumption. The high frequency oscillator is enabled only during a small portion of the clock's... | 06/16/1998 |
| 5748570 | Time correction of an electronic clock An electronic clock includes a usual oscillator and a more accurate oscillator. The usual oscillator generates a first frequency which causes the electronic clock to operate and the more accurate oscillator generates a second frequency which is used as a ... | 05/05/1998 |
| 5719827 | Highly stable frequency generator A highly stable frequency generator (G) comprises an oscillator (10) for generating a first frequency (F1), and further comprises a time base (BT) providing a time stable frequency signal which is independent of the temperature, and a feedback circuit arranged... | 02/17/1998 |
| 5717661 | Method and apparatus for adjusting the accuracy of electronic timepieces A method and apparatus for adjusting the accuracy of an electronic timepiece that includes an oscillator with a 2n frequency output, means for reducing the oscillator output frequency to a time keeping frequency, means for counting the time kee... | 02/10/1998 |
| 5644271 | Temperature compensated clock A temperature compensation system includes a first oscillator to generate a number of pulses which vary from a desired frequency as a function of temperature of the first oscillator. The system also includes a second oscillator to generate digital pulses ... | 07/01/1997 |
| 5546363 | Clock apparatus for forming time information for use in computer system A commercially available clock IC which is easily influenced by a temperature change or the like is used as it is, thereby easily allowing the clock IC to function as a high precision clock IC. A high precision oscillator is provided separately from a clo... | 08/13/1996 |
| 5375105 | Timekeeping rate regulator for crystal controlled watches and clocks An adjustable vibrations counter (20) and an elapsed time counter and switch (18) that select and adjust one second durations, the adjustment depending on whether the timekeeping rate of a watch or clock is fast or slow. The adjustable vibrations counter ... | 12/20/1994 |
| 5274545 | Device and method for providing accurate time and/or frequency A device and method provide for an accurate output from a unit, such as an oscillator and/or clock providing an output indicative of frequency and/or time. The device includes a processing section having a microprocessor that develops a model characterizi... | 12/28/1993 |
| 5245592 | Wearing time measuring device for a removable medical apparatus A medical apparatus to be worn in the mouth comprises a battery-fed measuring unit (15) including a clock generator (18) and a counter (20) for counting the pulses of the clock generator. Accuracy of the time measurement decisively depends on the precisio... | 09/14/1993 |
| 5168478 | Time standard assembly with upset protection and recovery means A time standard assembly for a global positioning system (GPS), such as for a space vehicle, has a natural-frequency atomic frequency standard (NAFS) which is operated at its natural resonant frequency in order to output an upset-proof natural frequency s... | 12/01/1992 |
| 5138707 | Method of operating a timer in a digital data processing system A method of operating a timer mechanism in a digital data processing system is described in which the contents of at least one timer register is updated by a predetermined time increment during each of successive periodic update cycles. Each update cycle ... | 08/11/1992 |
