Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1991-03-01
1992-10-13
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324686, 340620, G01R 2726
Patent
active
051554429
ABSTRACT:
The present invention provides a locator/monitor capable of locating a boring tool and monitoring the progress of the tool for control purposes. The locator/monitor may be used in expedited locating methodology and straightforward calibration techniques of the present invention. A durable and cost effective pitch sensor is also provided by the present invention. In addition, the present invention provides a slotted transmitter housing formed of an electrically conductive material, where the magnetic field generated by the transmitter is capable of penetrating to the surface.
REFERENCES:
patent: 3096591 (1963-07-01), Higgins et al.
patent: 3492951 (1976-11-01), Erspamer et al.
patent: 4674579 (1987-06-01), Geller et al.
patent: 4714118 (1987-12-01), Baker et al.
patent: 4787463 (1988-11-01), Geller et al.
Do Diep
Wieder Kenneth A.
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