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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7567120 | Varactor diode alternative circuit To avoid intermodulation interferences, a varactor diode alternative circuit has at least three varactor diodes connected in series alternatingly opposite to one another and a resistor and/or inductor network. At each of the varactor diodes, a control voltage suppli... | 07/28/2009 |
| 7378901 | Varactor device A varactor device includes a capacitance circuit having a capacitor set and a first transistor connected across the capacitor set; a first variable resistor; and a second transistor coupled to the first transistor and connected in series to the first variable resist... | 05/27/2008 |
| 7369394 | Variable capacitor, circuit module, and communications apparatus A variable capacitor includes a supporting substrate and a plurality of variable capacitance elements, and bias lines. The plurality of variable capacitance elements is formed on the supporting substrate, each of which is composed of a lower-laid first electrode lay... | 05/06/2008 |
| 7324043 | Phase shifters deposited en masse for an electronically scanned antenna A system and method for an electronically scanned antenna is provided in which phase shifters are deposited en masse along with other electronically scanned antenna components on a wafer scale substrate using a thin film process. Alternative wafer scale sizes may be... | 01/29/2008 |
| 7310264 | Rectifying charge storage memory circuit A composite rectifying charge storage device, consisting of a rectifier and capacitor which share common elements, is provided in a memory circuit or memory cell. In one form, the memory cell is adapted for alternative operation as a random access memory (RAM) or as... | 12/18/2007 |
| 7242243 | Voltage-controlled capacitor circuit and related circuitry with diode and MOS varactors A voltage-controlled capacitor circuit and related circuitry. The voltage-controlled capacitor circuit includes a metal-oxide semiconductor (MOS) varactor, a diode varactor, and/or a capacitor with fixed capacitance. The MOS varactor, the diode varactor and the capa... | 07/10/2007 |
| 7199698 | Digitally-controlled reference oscillators Varactor and reference oscillator structures are provided that are particularly suited for integrated circuit fabrication and which provide excellent parameter performance (e.g., monotonicity, linearity, low phase noise and low differential and integral non-linearit... | 04/03/2007 |
| 7173449 | Signal transmission system Signal transmission technology for transmitting 20–50 GHz band digital high speed signals, while keeping to the system structure and element structure of the prior art is provided. A signal transmission system is provided in which the driver and the receiver compr... | 02/06/2007 |
| 7091799 | Hybrid bypass networks for low-loss cables and ripple filter chokes Losses are reduced in electrical conductors and filters, especially those made with superconducting cables or inductors, which carry currents having both direct current (DC) and alternating current (AC) portions as in rectifier busses and power distribution systems.... | 08/15/2006 |
| 7092232 | Variable capacitance capacitor, circuit module, and communications apparatus A variable capacitance capacitor has a plurality of variable capacitance elements, using a thin-film dielectric layer whose dielectric constant varies with voltage application, connected in series with one another between the high-frequency signal input and output t... | 08/15/2006 |
| 7071507 | High-voltage CMOS-compatible capacitors A high-voltage stacked capacitor includes a first capacitor and a second capacitor. Each capacitor includes a first plate comprising a first semiconductive body and a second plate comprising a floating electrode. The first and second semiconductive bodies are electr... | 07/04/2006 |
| 7049181 | Method of making heterojunction P-I-N diode A heterojunction P-I-N diode switch comprises a first layer of doped semiconductor material of a first doping type, a second layer of doped semiconductor material of a second doping type and a substrate on which is disposed the first and second layers. An intrinsic ... | 05/23/2006 |
| 7038527 | MOS varactor for LC VCOs A metal oxide semiconductor (MOS) varactor device has a source and a drain connected to each other, and a back gate, electrically separate from the source and drain, which is connected to a circuit common mode point. ... | 05/02/2006 |
| 7012483 | Tunable bridge circuit A tuning circuit for use in an electrical circuit network is disclosed. The tuning circuit includes a bridge circuit. The bridge circuit comprises a first adjustable capacitance grouping, a second adjustable capacitance grouping and a third adjustable capacitance gr... | 03/14/2006 |
| 7002435 | Variable capacitance circuit, variable capacitance thin film capacitor and radio frequency device There is disclosed a variable capacitance circuit which comprises: first to Nth variable capacitance elements C1-CN (N is an odd number) sequentially connected in series between an input terminal I and an output terminal O, whose capacitances change depending... | 02/21/2006 |
| 6933774 | Rectifying charge storage element with transistor A composite rectifying charge storage device, consisting of a rectifier and a capacitor which share common elements, further includes a transistor. ... | 08/23/2005 |
| 6924691 | Rectifying charge storage device with sensor A rectifying charge storage device, consisting of a rectifier and capacitor which share common elements, includes a sensor responsive to a monitored parameter such as pressure or the presence of a target chemical agent, to produce a variable and detectable electroni... | 08/02/2005 |
| 6921936 | pn Varactor An object of this invention is to provide a pn-varactor having a small resistance and capable of coinciding with incorporation of a circuit employing LC resonance into an integrated circuit. A dummy gate pattern 4 is formed over a n-well 1 in a semicon... | 07/26/2005 |
| 6861680 | Silicon-on-insulator diodes and ESD protection circuits A silicon-on-insulator (SOI) gated diode and non-gated junction diode are provided. The SOI gated diode has a PN junction at the middle region under the gate, which has more junction area than a normal diode. The SOI non-gated junction diode has a PN junction at the... | 03/01/2005 |
| 6859093 | Rectifying charge storage device with bi-stable states A rectifying charge storage device, consisting of diode and capacitor components which share common elements, includes a bi-stable state element responsive to an input signal for opening or closing a circuit, as by changing to one of two definable stable states. The... | 02/22/2005 |
| 6781855 | Power diverter A power diverter is presented. The power diverter includes a first ninety degree hybrid having one output coupled to a positive adjustable phase shifter and another output coupled to a negative adjustable phase shifter providing a negative phase shift. The value of ... | 08/24/2004 |
| 6731153 | Semiconductor integrated circuit having switching transistors and varactors A CMOS line driver is made up of p- and nMOS transistors. A pMOS varactor is interposed between the source of the pMOS transistor and a power supply, while an nMOS varactor is interposed between the source of the nMOS transistor and ground. The sizes of each of thes... | 05/04/2004 |
| 6674321 | Circuit configuration for DC-biased capacitors A capacitive element includes two or more voltage-variable capacitors (varactors). The varactors are configured so that they are coupled in series with respect to an applied AC signal and are coupled in parallel with respect to an applied DC bias voltage.... | 01/06/2004 |
| 6649944 | Silicon-on-insulator diodes and ESD protection circuits A silicon-on-insulator (SOI) gated diode and non-gated junction diode are provided. The SOI gated diode has a PN junction at the middle region under the gate, thus providing more junction area than a normal diode. The SOI non-gated junction diode has a PN... | 11/18/2003 |
| 6646499 | Voltage-controlled capacitor A voltage-controlled capacitor is configured in such a way that it contains two varactors connected in parallel. The varactors are connected in such a way that a capacitance is controlled by differential signals. This layout results in a voltage-controlle... | 11/11/2003 |
| 6225861 | Variable capacitance circuit In order to provide a variable capacitance circuit having very small voltage dependability, this circuit is constituted by two variable capacitance diodes. An input signal is applied to each of said diodes with backward polarity and a capacitance control ... | 05/01/2001 |
| 5990761 | Phase shifter circuit with high linearity A phase shifter circuit shifts the phase of a voltage varying RF signal at high RF power levels by using a diode arrangement of back to back diode sets connected in series to reduce the change in capacitive reactance of the diode arrangement. The diode ar... | 11/23/1999 |
| 5694071 | Electronic device comprising means for compensating an undesired capacitance A device compensated for an undesired capacitance includes a first and a second node between which nodes the undesired capacitance is present. A diode driven in breakthrough is coupled between the first and the second node. As a diode driven in breakthrou... | 12/02/1997 |
| 5680073 | Controlled semiconductor capacitors A controlled capacitor system, which includes a capacitor element (C1) and a forward-biased diode element (D2) connected in series with the capacitor element (C1). The system is such that the diode element (D2) has a capacitance which is less than the cap... | 10/21/1997 |
| 5389832 | Capacitively cross-coupled DCS emitter-follower output stage An output stage device for an enhanced differential current switch. The output stage receives a differential signal pair from a prior logic stage and must shift the output signals to the levels necessary for the next stage. The output stage has a differen... | 02/14/1995 |
| 5378937 | Equalizer for optical communication systems To compensate for nonlinear signal distortions in analog optical communication transmission systems, caused by laser chirps and the chromatic dispersion of the optical fiber, an equalizer in the form of an LC component is known, whose capacitance is forme... | 01/03/1995 |
| 5357222 | Voltage controlled component including a capacitive diode biased to operate in the linear region The invention relates to a biased electronic circuit in which a voltage-controlled component has a characteristic with a non-linear portion and a substantially linear portion. The circuit is biased by a voltage being applied to one terminal of the compone... | 10/18/1994 |
| 5327017 | Circuit arrangement for switching of RF signals A circuit arrangement for switching-through (transit switching) of RF-signals is provided. The signals from several RF-signal sources are switched via controlled diode paths wherein capacitance diodes are used for achieving a high value of decoupling betw... | 07/05/1994 |
| 5039873 | Microwave elements with impedance control circuits A microwave element includes an impedance control circuit for controlling the capacitance between the source and the drain of an FET in the off state including a series-connected diode and capacitor connected in parallel between the source and drain of th... | 08/13/1991 |
| 4701714 | Tunable delay line A lumped-parameter, electrical delay line having shunt capacitance including variable-capacitance diodes. A tuning voltage applied to the diodes provides electrically variable delay at low jitter and stable insertion delay.... | 10/20/1987 |
| 4689498 | Signal input circuit with constant operating power A signal input circuit composed of a control member, such as a PIN diode, for controllable attenuation of an input signal, and reactances for selection of the input signal, wherein the signal frequency current is regulated by the control member such that ... | 08/25/1987 |
| 4621205 | Method and apparatus for reducing varactor noise The deliberate use of multiple, seemingly redundant, varactor diodes to reduce noise in applications where a single varactor diode would otherwise be adequate.... | 11/04/1986 |
| 4481823 | Ultrasonic probing devices The device comprises n spaced transducers associated with a generator through phase-shift means. These means are formed by members (66) for supplying, on different channels and from the same pulse of the generator, pulses with different time delays. Ampli... | 11/13/1984 |
| 4214252 | Semiconductor device having a MOS-capacitor A semiconductor element having a MOS-capacitor between a zone provided in an epitaxial layer on a substrate and a conductive layer on an insulating layer above the zone. The stray capacitance between the zone and the substrate of the opposite conductivity... | 07/22/1980 |
| 4195274 | Temperature compensating circuit for varactor diodes A temperature compensating circuit for a varactor diode having a voltage source applied to a temperature compensating diode which is provided separately from a control voltage for controlling the varactor diode and which is unaffected by a varactor diode ... | 03/25/1980 |
