Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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 |
| 7312590 | Model railroad velocity controller Control over velocity of a model train may be determined based upon the speed of rotation of a control knob. A processor receives electronic pulses indicating rotation of the knob beyond a predetermined increment of angular distance. The processor calculates the amo... | 12/25/2007 |
| 6121850 | Digitally adjustable inductive element adaptable to frequency tune an LC oscillator A digitally adjustable inductive element which can be implemented in an integrated circuit. The digitally adjustable inductive element can include a first inductor, and a digital inductance controller operatively coupled to the first inductor which can be... | 09/19/2000 |
| 6060956 | Variable capacitance circuit The invention provides an improved variable capacitance circuit which is substantially linearly controlled using voltage or current control. The circuit comprises two emitter connector transistors and a constant current source or drain forming a current s... | 05/09/2000 |
| 5499056 | Bandswitchable double tuned RF circuit with balanced secondary A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first capacitor coupled in parallel with the first inductances. A seco... | 03/12/1996 |
| 5339117 | Tuning apparatus for television system and method of controlling the same Tuning apparatus for a television system, comprising a rotary encoder having a slidable and rotatable channel changing mechanism, the rotary encoder outputting a plurality of signals with a phase difference with respect to one another, corresponding to a ... | 08/16/1994 |
| 4609894 | Tuning device A tuning device has a dial drum rotatably supported in a frame, and a rheostat operatively connected to the dial drum. A knob is disposed in alignment with the dial drum. The dial drum has an outer toothing formed on the periphery thereof. A drive gear is... | 09/02/1986 |
| 4595910 | Digital-to-analog converter useful in a television receiver A digital-to-analog converter suitable for use in a television tuning system for converting bits of a digital word to a corresponding tuning voltage includes a first digital-to-duty factor converter responsive to a group of the most significant bits of th... | 06/17/1986 |
| 4408172 | Variable speed tuning selector A touch sensitive variable speed tuning selector is disclosed. A rotary tuning selector knob includes a finger contact coupled to touch sensitive circuitry. Tuning selector rotation causes a shaft encoder to provide a first pulsed output to tuning circuit... | 10/04/1983 |
| 4298851 | Presettable tuning apparatus A presettable tuning apparatus includes a digital tuner; a source of digital signals representing radio frequencies to which the tuning apparatus is respectively tuned; an addressable memory having a plurality of sequentially addressable storage locations... | 11/03/1981 |
| 4267601 | Tuning control apparatus for a frequency synthesizer tuner Tuning control apparatus is provided for use with a frequency synthesizer tuner of the type having a phase-locked loop including a reference oscillator, a variable frequency oscillator to produce a local oscillating signal, a programmable frequency divide... | 05/12/1981 |
| 4249132 | Continuous tuning arrangement for a multiband television receiver A television tuning system for generating a tuning voltage for a varactor controlled local oscillator includes a continuous resistive element having first, second, third and fourth points along its resistive path which define first, second and third resis... | 02/03/1981 |
| 4165507 | Non-linear digital to analog conversion by intermediate conversion to time interval A circuit network for the non-linear digital-to-analog conversion of a periodic pulse signal having a linear average value which depends on a digital value into a direct current signal, wherein said network has different charge and discharge time constant... | 08/21/1979 |
| 4138654 | Digitally tuned circuit including switching of bank capacitors between plural tuned circuits An electrically tuned filter arrangement including several tuned filters which may alternatively be coupled to the input and output of the filter arrangement so as to provide the arrangement with different tuning ranges. Each tuned filter has a tuning inp... | 02/06/1979 |
| 4118679 | VHF, UHF and superband tuner with automatic switching A combination VHF, UHF and superband tuner, the superband and UHF tuners cooperating with the Channel 1 section of the VHF tuner, is provided with a connection network including voltage sensitive switching devices, such as voltage sensitive diodes, so tha... | 10/03/1978 |
| 4074216 | Receiver tuning circuit A receiver tuning circuit in which without operation of extra switches a change-over can be made from tuning by means of a continuously varying tuning voltage to tuning by means of one of a number of adjusted tuning voltages by using a capacitor controlle... | 02/14/1978 |
| 4031491 | Tuning apparatus using a voltage-dependent reactance element A tuning apparatus using a voltage-dependent reactance element comprising a tuning circuit including a voltage-dependent reactance element as a tuning element, a voltage sweep circuit for generating a sweep tuning voltage to be applied to the voltage-depe... | 06/21/1977 |
| 3962640 | Frequency selection and control An automatic oscillator frequency control is provided for operations such as employed in channel selection in radio and television receiver systems. A code is stored representative of a selected frequency band within which a selected channel is located. T... | 06/08/1976 |
