US5155442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position and orientation locator/monitor
Assignee: Merlin Technology Inc
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Filing: 1991-03-01
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Granted: 1992-10-13
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Expires: 2011-03-01
Abstract
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.
Inventors
- 👤 John Mercer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15; G01V3/165; E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; E21B47/0228; E21B47/0232; G01C; G01C9/00; G01C9/02; G01C9/06; G01C9/18; G01C9/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A pitch sensor capable of generating an output voltage indicative of fluid displacement within the pitch sensor, comprising: a first outer electrically conductive portion; a second outer electrically conductive portion electrically insulated from the first outer conductive portion; an inner electrically conductive portion exhibiting equal electrical properties with respect to the outer conductive portions when in a baseline, zero pitch orientation and exhibiting unequal electrical properties with respect to the outer conductive portions when in a non-baseline orientation; and a flowable material through which electrical connections between the outer portions and the inner portion are made, such that a ratio between an electrical property of the first outer portion and the inner portion to the electrical property of the second outer portion and the inner portion is indicative of fluid displacement, wherein the pitch sensor is capable of generating an output voltage indicative of fluid displacement regardless of the circumferential rotation of the pitch sensor about it baseline.
Claim 2
Dependent Claim
158 words
A pitch sensor capable of generating an output voltage indicative of fluid displacement within the pitch sensor, comprising: a first outer electrically conductive portion; a second outer electrically conductive portion electrically insulated from the first outer conductive portion; an inner electrically conductive portion exhibiting equal electrical properties with respect to the outer conductive portions when in a baseline, zero pitch orientation and exhibiting unequal electrical properties with respect to the outer conductive portions when in a non-baseline orientation; and a flowable material through which electrical connections between the outer portions and the inner portion are made, such that a ratio between an electrical property of the first outer portion and the inner portion to the electrical property of the second outer portion and the inner portion is indicative of fluid displacement, wherein the pitch sensor is capable of generating an output voltage indicative of fluid displacement regardless of the circumferential rotation of the pitch sensor about it baseline.
Claim 3
Dependent Claim
22 words
A pitch sensor according to claim 1 wherein the flowable material is an electrically conductive fluid and the electrical property is conductivity.
Claim 4
Dependent Claim
33 words
A pitch sensor according to claim 2 wherein the flowable material comprises a highly viscous fluid in combination with a conductive fluid or a salt which provides the viscous fluid with conductive properties.
Claim 5
Dependent Claim
21 words
A pitch sensor according to claim 1 wherein the flowable material is a dielectric fluid and the electrical property is capacitance.
Claim 6
Dependent Claim
25 words
A pitch sensor according to claim 1 wherein the pitch sensor is sized and configured for highly sensitive pitch measurements over a narrow pitch range.
Claim 7
Dependent Claim
23 words
A pitch sensor according to claim 1 wherein the pitch sensor is sized and configured to measure pitch over a wide pitch range.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |