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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7183839 | Diode detecting circuit A diode detecting circuit which cancels temperature dependence of a detecting diode so as to obtain highly sensitive detection. The diode detecting circuit has a first diode detecting unit in which a first diode detects an input signal biased by a bias voltage, a se... | 02/27/2007 |
| 6943847 | FM demodulator for SECAM decoder A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominato... | 09/13/2005 |
| 4618829 | Bridge circuit demodulator A bridge circuit demodulator for frequency-modulated signals includes a parallel resonant circuit tuned to the carrier frequency of the FM signals. The resonant circuit includes the secondary winding of a transformer which is strongly coupled to the secon... | 10/21/1986 |
| 4006424 | Wide bandwidth crystal frequency discriminator circuit Frequency discriminators are disclosed employing a crystal filter having a predetermined voltage versus frequency characteristic including a discriminator operating portion slightly below the filter lower cutoff frequency along which the voltage varies su... | 02/01/1977 |
| 3997797 | Frequency discriminating circuit A frequency discriminating circuit having a double tuned circuit with a transformer, which has a first and second resonant circuits. The first resonant circuit is composed of a capacitor, a primary winding of the transformer and a first variable inductanc... | 12/14/1976 |
