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| Number | Title | Issue Date |
| 4096839 | Internal combustion engine air-fuel ratio control system utilizing oxygen sensor An air-fuel ratio control system for an internal combustion engine utilizes an oxygen sensor to maintain a 14.5/1 air-fuel ratio at a first location in an intake manifold to an engine combustion chamber. A method and apparatus is disclosed for adding fuel... | 06/27/1978 |
| 4083616 | Printed wiring board levered inject-eject cam A levered inject-eject cam device is provided for pivotal mounting at the upper and lower corners of the rear edge of a printed wiring board. The cam is constructed of an integral molded body member having a bifurcated configuration which forms branching ... | 04/11/1978 |
| 4042789 | Tone combination detector and coincidence timer circuit A tone receiver for detecting a Dual Tone Multi-Frequency (DTMF) signal includes first and second digital tone detectors for the high and low bands, respectively. These detectors are of the type which employ the period detection technique. Each detector h... | 08/16/1977 |
| 4042788 | Tone detector A digital tone detector is of the period detection type employing a digital counter which is stepped by means of a high speed clock. The counter is reset by zero-crossings of an analog tone signal. A set of period range decoder gates indicate the presence... | 08/16/1977 |
| 4042790 | Voice guard circuit for a tone receiver Analog detection of invalid signal conditions at the input to a Dual Tone Multiple Frequency (DTMF) tone receiver is provided. The average of the voltage peak amplitudes of the signals in the upper and lower bands of the DTMF signal are crossed compared, ... | 08/16/1977 |
| 4042787 | Output processing and output coupling circuit for a digital tone receiver A circuit is provided to convert a set of mutually exclusive digital signals representing presence or absence of individual tones of a Dual Tone Multiple Frequency (DTMF), or 2-of-8 signal, system into a four digit binary code word. Each different four bi... | 08/16/1977 |
| 3999137 | Low pass active filter apparatus The subject of the disclosure is low-pass filter apparatus for use in filtering out noise in a signal channel for propagating PAM signals. A sample and hold circuit which operates in synchronism with the presence of PAM pulses is provided as the input sec... | 12/21/1976 |
| 3939430 | Integrated circuit, image and sum enhanced balanced mixer A balanced microwave diode mixing circuit utilizes the junction of a slot transmission line and a coplanar strip transmission line as the point of diode modulation to provide heterodyne mixing. By the use of slot line type elements formed on one side of a... | 02/17/1976 |
