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Grondahl
Chris Grondahl, Gilbert, AZ US
| Patent application number | Description | Published |
|---|---|---|
| 20090219111 | PHASE SHIFTER WITH FLEXIBLE CONTROL VOLTAGE - The invention provides a phase shifter with flexible control voltage that is useful with all RF systems that phase shift a RF signal. The phase shifter according to the present invention may comprise transistors used as switching elements. In one aspect, the phase shifter provides the option of controlling a phase shifter with either a positive or a negative voltage control signal. For example, the dc ground of the transistors included in the phase shifter may be floated, either fixed or adjusted. The RF grounding of the transistors may be achieved by in-band resonant capacitors. Thus, the control voltage provided to the transistors is flexible in that it may be connected to a positive or negative control voltage, or it may be connected to ground, or it may swing from a positive control voltage to a negative control voltage or vice versa. | 09-03-2009 |
| 20090219112 | PHASE SHIFTER WITH FLEXIBLE CONTROL VOLTAGE - The invention provides a phase shifter with flexible control voltage that is useful with all RF systems that phase shift a RF signal. The phase shifter according to the present invention may comprise transistors used as switching elements. In one aspect, the phase shifter provides the option of controlling a phase shifter with either a positive or a negative voltage control signal. For example, the dc ground of the transistors included in the phase shifter may be floated, either fixed or adjusted. The RF grounding of the transistors may be achieved by in-band resonant capacitors. Thus, the control voltage provided to the transistors is flexible in that it may be connected to a positive or negative control voltage, or it may be connected to ground, or it may swing from a positive control voltage to a negative control voltage or vice versa. | 09-03-2009 |
Christian Grondahl, Vaerlose DK
| Patent application number | Description | Published |
|---|---|---|
| 20080311656 | Meiosis arrest in oocytes in vitro - The method for in vitro synchronisation of nuclear and cytoplasmatic maturation of GV oocytes from domestic animals or from primates can be improved if a phosphodiesterase type 3 inhibitor is added to the medium after collection of the oocytes and, thereafter, said phosphodiesterase type 3 inhibitor is removed to allow the nuclear maturation to proceed. | 12-18-2008 |
Christopher D. Grondahl, Gilbert, AZ US
| Patent application number | Description | Published |
|---|---|---|
| 20090115512 | DISTRIBUTED DOHERTY AMPLIFIERS - Doherty and distributed amplifier (DA) designs are combined to achieve, wideband amplifiers with high efficiency dynamic range. A modified Doherty amplifier includes a wideband phase shifter providing first and second outputs, a main amplifier coupled to the first output, an auxiliary amplifier coupled to the second output, and a wideband combining network combining the outputs in phase. A multi-stage DA has a main output and a termination port, and a phase delay module and transforming network allowing power at the termination port to be combined in phase with power at the main output. In one combination, one or more stages of the DA may comprise a Doherty amplifier. In another combination, a modified series-type Doherty amplifying system is achieved by cascading main and auxiliary DAs. In any combination, Doherty topology may include a bias control module. | 05-07-2009 |
| 20100117766 | CAPACITIVELY LOADED SPURLINE FILTER - In an exemplary embodiment, a spurline filter comprises a capacitive element connected to a spur and either a through-line of the spurline filter or ground. In another embodiment, multiple capacitive elements are connected to the spur. In an exemplary embodiment, the capacitively loaded spurline filter provides a band rejection frequency response similar to the band rejection frequency response of a similar spurline filter that does not comprise at least one capacitive element but the capacitively loaded spurline filter has half the layout area or less. In an exemplary embodiment, the spurline filter comprises capacitive elements, where the capacitive elements are configured to reduce the resonant frequency of the filter. | 05-13-2010 |
Clayton M. Grondahl, Rexford, NY US
| Patent application number | Description | Published |
|---|---|---|
| 20100007093 | Seal Assembly and Rotary Machine Containing Such Seal - A seal assembly which, among other applications, may be used for sealing fluid leakage between a steam or combustion (gas) turbine rotor and a turbine stator body. The seal assembly includes elements having a plurality of spaced leaf seal members with slots therebetween. Each leaf seal member is angled out-of-plane between a fixed end and a free end thereof, and the free ends slidably engage the rotatable component. A support may be provided supporting the free end such that it contacts a distal end of the support in an operative state and is out of contact with the distal end in an inoperative state. Seal members may include two different materials having different coefficients of thermal expansion. In one embodiment at least one damping leaf can be provided on a low pressure side of a leaf seal member. | 01-14-2010 |
| 20110135454 | LEAF SEAL ASSEMBLY INCLUDING POLYMER MEMBER AND ROTARY MACHINE CONTAINING SUCH SEAL ASSEMBLY - A seal assembly which, among other applications, may be used for sealing fluid leakage between low temperature multistage compressors and pumps, steam turbine rotors and turbine stator bodies. In accordance with the invention a seal assembly is provided that comprises a leaf seal including a plurality of staggered leaf seal members; and a polymer member disposed on a high pressure side of the leaf seal, wherein the polymer member is in compliant contact with the leaf seal. | 06-09-2011 |
Erik Grondahl, Them DK
| Patent application number | Description | Published |
|---|---|---|
| 20090146426 | Power converters - The present invention provides a power converter that can be used to interface a generator ( | 06-11-2009 |
| 20090146500 | Power converters - The present invention provides a power converter that can be used to interface a generator ( | 06-11-2009 |
| 20090147549 | Power converters - The present invention provides a power converter that can be used to interface a generator ( | 06-11-2009 |