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| Number | Title | Issue Date |
| 4092517 | Electric arc welding processes and apparatus therefor There is provided a method and apparatus for electric-arc welding, in which an alternating current of positive and negative pulses is supplied to produce an electric arc between a welding electrode and a workpiece. The ratio of the durations of the positi... | 05/30/1978 |
| 4091675 | Samplers A sampler for taking samples continuously, at a rate proportional to flow, in which the head of liquid is sensed by capacitor probes and a voltage is generated for driving a stepping motor, the stepping motor being used to operate a pump controlling sampl... | 05/30/1978 |
| 4087672 | Laser removal of material from workpieces To ascertain the beam intensity threshold at which the intensity of a laser beam will just be sufficient to engrave a workpiece, the value of a beam-intensity control signal is progressively increased or decreased until engraving starts or stops, this bei... | 05/02/1978 |
| 4086528 | Capacitive transducers Measuring apparatus for determining a linear quantity comprising a capacitance transducer having at least one capacitance variable in accordance with changes in the dimensions of the quantity being measured, and a reference capacitor of substantially cons... | 04/25/1978 |
