Patent application number | Description | Published |
20140034310 | MULTI-ZONE CEMENTED FRACTURING SYSTEM - A method of cementing a liner string into a wellbore includes deploying a liner string into a wellbore; pumping cement slurry into a workstring; and pumping a dart through the workstring, thereby driving the cement slurry into the liner string. The dart engages a first wiper plug and releases the first wiper plug from the workstring. The dart and engaged first wiper plug drive the cement slurry through the liner string and into an annulus formed between the liner string and the wellbore. The dart and engaged first wiper plug land onto a first fracture valve. The dart releases a first seat into the first wiper plug. The dart engages a second wiper plug connected to the first fracture valve and releases the second wiper plug from the first fracture valve. | 02-06-2014 |
20150083440 | Rotatably-Actuated Fluid Treatment System Using Coiled Tubing - A system for treating a formation of a borehole having casing has a sleeve, a motor, and a packer. The sleeve is disposed on the casing in the borehole and has a port communicating out of the sleeve. An insert disposed in the sleeve is movable in the sleeve from closed to opened position relative to the port. The motor is deployed in the casing with coiled tubing and is operable to impart rotation. The packer is operatively coupled to the motor. In response to the rotation imparted by the motor, the packer sets in the insert of the sleeve and moves the insert to the opened condition. | 03-26-2015 |
20150152710 | METHOD AND APPARATUS FOR TREATING A WELLBORE - The present invention generally concerns the treatment of hydrocarbon-bearing formations adjacent a wellbore. In one embodiment, fracturing jobs are performed through the use of subs disposed in a casing string having profiles that interact with profiles formed on retractable keys of a tool. | 06-04-2015 |
20150152712 | METHOD AND APPARATUS FOR TREATING A WELLBORE - The present invention generally concerns the treatment of hydrocarbon-bearing formations adjacent a wellbore. In one embodiment, fracturing jobs are performed through the use of subs disposed in a casing string having profiles that interact with profiles formed on retractable keys of a tool. | 06-04-2015 |
20150152714 | METHOD AND APPARATUS FOR TREATING A WELLBORE - The present invention generally concerns the treatment of hydrocarbon-bearing formations adjacent a wellbore. In one embodiment, fracturing jobs are performed through the use of subs disposed in a casing string having profiles that interact with profiles formed on retractable keys of a tool. | 06-04-2015 |
Patent application number | Description | Published |
20080278230 | Systems and Methods for Correcting Errors Resulting from Component Mismatch in a Feedback Path - Systems and methods for minimizing performance degradation due to component mismatch in the feedback path of a digital PWM amplifier feedback loop. One embodiment comprises a digital pulse width modulated (PWM) amplifier with feedback. The amplification subsystem receives a digital audio signal and produces an analog output signal. The feedback loop produces a feedback signal based on the filtered analog output signal and modifies the digital audio signal based on the feedback signal. The feedback loop includes a filter configured to filter the analog output signal and correction circuitry configured to correct component mismatch errors introduced by the filter. In one embodiment, the correction circuitry receives a measurement of a power supply voltage, multiplies the measured voltage by a gain and adds the scaled measurement to the feedback signal to correct for the component mismatch errors. | 11-13-2008 |
20090027117 | Low-Noise, Low-Distortion Digital PWM Amplifier - Systems and methods for performance improvements in digital switching amplifiers using low-pass filtering to reduce noise and distortion. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low-pass filter configured to filter audio signals output by the plant. The filtered output of the plant is added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC. | 01-29-2009 |
20090027118 | Digital PWM Amplifier Having a Low Delay Corrector - Systems and methods for performance improvements in digital switching amplifiers using a low delay corrector. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low delay corrector configured to receive signals output by the plant. The output of the low delay corrector is added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC. | 01-29-2009 |
20090302938 | LOW DELAY CORRECTOR - A low delay corrector (LDC) unit includes a non-linear function generator and a filter. The nonlinear function generator receives a first signal and outputs a second signal in dependence on the first signal and a transfer function of the nonlinear function generator. The filter is fed in dependence on the second signal output by the nonlinear function generator. The first signal received by the nonlinear function generator is derived in dependence on an input signal provided to an input of the LDC unit and an output of the filter. An output of the LDC unit is derived in dependence on the first signal received by the nonlinear function generator and the second signal output by the nonlinear function generator. | 12-10-2009 |
Patent application number | Description | Published |
20100262553 | METHOD FOR COMPLYING WITH EMPLOYMENT ELIGIBILITY VERIFICATION REQUIREMENTS - A method is provided for determining employer compliance in determining employment eligibility requirements in accordance with federal immigration regulations. Compliance alerts and compliance tips are displayed for guiding employers in verifying employment eligibility. Completed employment eligibility forms are automatically audited to analyze whether the employer has accurately completed the employment verification. The completed forms are audited by applying various compliance rules to a completed employment eligibility form, presently a Form I-9, to determine compliance with the applicable regulations. A listing is provided of various errors and additional data required to complete the audited form. The method is preferably administered by a single service provider for multiple employers, to assure that changes in the applicable regulations are regularly incorporated. A central system is provided for managing all of the employment eligibility forms associated with particular employers, to assure continued compliance with federal regulations. | 10-14-2010 |
20140052657 | METHOD FOR COMPLYING WITH EMPLOYMENT ELIGIBILITY VERIFICATION REQUIREMENTS - A method is provided for determining employer compliance in determining employment eligibility requirements in accordance with federal immigration regulations. Compliance alerts and compliance tips are displayed for guiding employers in verifying employment eligibility. Completed employment eligibility forms are automatically audited to analyze whether the employer has accurately completed the employment verification. The completed forms are audited by applying various compliance rules to a completed employment eligibility form, presently a Form I-9, to determine compliance with the applicable regulations. A listing is provided of various errors and additional data required to complete the audited form. The method is preferably administered by a single service provider for multiple employers, to assure that changes in the applicable regulations are regularly incorporated. A central system is provided for managing all of the employment eligibility forms associated with particular employers, to assure continued compliance with federal regulations. | 02-20-2014 |
20140304179 | Method for Complying with Employment Eligibility Verification Requirements - A method is provided for determining employer compliance in determining employment eligibility requirements in accordance with federal immigration regulations. Compliance alerts and compliance tips are displayed for guiding employers in verifying employment eligibility. Completed employment eligibility forms are automatically audited to analyze whether the employer has accurately completed the employment verification. The completed forms are audited by applying various compliance rules to a completed employment eligibility form, presently a Form I-9, to determine compliance with the applicable regulations. A listing is provided of various errors and additional data required to complete the audited form. The method is preferably administered by a single service provider for multiple employers, to assure that changes in the applicable regulations are regularly incorporated. A central system is provided for managing all of the employment eligibility forms associated with particular employers, to assure continued compliance with federal regulations. | 10-09-2014 |