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Eldon Marvin Sutphin, Jr. Patents |
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Inventor: Sutphin, Jr.; Eldon Marvin
Address: Merrimack, NH
No. of patents: 4
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4062232 |
Testing compression in engines from starter motor current waveform |
December 13, 1977 |
| The relative compression in the cylinders of an internal combustion engine is tested by analyzing the starter motor current waveform when the engine is cranked with the ignition or the fuel inhibited. In asymmetrical engines, where the compression strokes of individual cylinders are |
| 3995224 |
Fast automatic gain control circuit with adjustable range |
November 30, 1976 |
| An automatic gain control circuit has its a-c signal input terminal connected directly to the numerator input of an analog divider, and connected through a peak detector to the denominator input of the analog divider. The quotient terminal of the analog divider provides a gain-contro |
| 3978719 |
Tachometer without physical connection to internal combustion engine |
September 7, 1976 |
| A tachometer includes a transducer for sensing pressure variations at the end of the exhaust pipe, or other easily-accessible point, due to explosions in an internal combustion engine. The transducer produces a corresponding electrical signal having a prominent selected frequency com |
| 3978416 |
Filter which tracks changing frequency of input signal |
August 31, 1976 |
| A tracking band-pass filter useful for locking onto, and passing, an input signal which changes rapidly in frequency. The filter has a frequency pass band controlled by a voltage which is derived from the output signal passed by the filter. The output signal is translated from a sine wav |
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