Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7170261 | Generator with dual cycloconverter for 120/240 VAC operation A generator system has two modes of operation, such as 120 VAC and 240/120 VAC. The generator system has a permanent magnet generator with two independent sets of windings that each generate a three phase AC voltage. One three phase AC voltage is coupled to a first ... | 01/30/2007 |
| 7150806 | Spiral-shaped lamp for UV curing of coatings and bonding for a digital versatile disk (DVD) or compact disk (CD) A spiral-shaped lamp (10) is used for disk manufacturing processes, such as curing of coating or bonding, to provide uniform intensity of UV energy to the circular disk without requiring relative motion between the disk and the lamp during the curing process.... | 12/19/2006 |
| 7026820 | Method and apparatus for minimizing direct coupling for downhole logging devices A method and apparatus for minimizing direct coupling between transmitters and receivers on a downhole logging tool are disclosed. One embodiment includes a transmitter, a bucking device, and a plurality of receivers, where signals may be directly coupled from the t... | 04/11/2006 |
| 6677757 | Method and apparatus for determination of electromagnetic properties of underground structure A method is provided for detecting geophysical anomalies. Electrical energy is capacitively accumulated with a charging circuit until a breakdown voltage of a switch is reached. Thereafter, the accumulated electrical energy is discharged by passing a disc... | 01/13/2004 |
| 5587659 | Towable array for measuring the resistivity of a terrain utilizing a low power level The measurement equipment serves to map the subsurface geology in a terrain by means of electrical profiling. A plurality of drag electrodes are used for this purpose, the electrodes with specific mutual spacing, being hooked together with a tow in the fo... | 12/24/1996 |
| 5523687 | Magnetic flux guide having tongues and magnetoresistive transducer incorporating said guide Magnetic flux guide having tongues and magnetoresistive transducer incorporating said guide. A transducer is provided which includes a magnetic flux guide having first and second parts longitudinally separated by a head gap and a magnetoresistive bar posi... | 06/04/1996 |
| 4942361 | Method and apparatus for determining earth resistivities in the presence of extraneous earth currents Method and apparatus for measuring apparent earth resistivity, by determining potential drop produced by electric current injected into the ground. Periodic, or very low frequency polarity reversal of direct current is used to eliminate induced voltage er... | 07/17/1990 |
| 4535293 | Method for geophysical prospecting using impulsine currents In a method of geophysical prospection a transmitter dipole and a receiver dipole which is sensitive to an electromagnetic field are positioned in cooperation with the subsoil. An impulsive excitation current is applied repeatedly to the transmitter dipol... | 08/13/1985 |
| 4417210 | Method of geophysical prospection using transient currents In a method of geophysical prospection a transmitter dipole and a receiver dipole which is sensitive to an electromagnetic field are positioned in cooperation with the subsoil. An impulsive excitation current is applied repeatedly to the transmitter dipol... | 11/22/1983 |
| 4063161 | Buried cable fault locator with earth potential indicator and pulse generator A fault locator of the earth potential gradient type for locating faults in underground, unshielded, insulated, electrical power cables includes a high voltage pulsing unit for generating and applying high voltage pulses to a faulted power cable. The puls... | 12/13/1977 |
| 3959721 | Method employing D.C. pulses for the detection of disseminated or massive mineralization within the earth crust by producing an A.C. electromagnetic field Pulses of direct current are applied to the ground by means of a pair of electrodes or by means of a coil. These pulses produce an alternating current magnetic field if they are in the vicinity of a zone of mineralization. These secondary currents are mea... | 05/25/1976 |
