US3997909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High carrier velocity magnetic sensor
Assignee: International Business Machines Corp
•
Filing: 1975-05-14
•
Granted: 1976-12-14
•
Expires: 1995-05-14
Abstract
Abstract A semi-conductive magnetic flux sensor is disclosed in which semi-conductive material having a resistance on the order of at least 500 ohms per square is placed in a lateral electric field of at least 500 volts per centimeter. A signal probe or contact located between the two lateral field contacts produces an output voltage when the sensor is subjected to magnetic fields having at least some component perpendicular to the plane of the three contacts. The device is highly sensitive and yields approximately one order of magnitude higher signal output than conventional Hall type semi-conductive magnetic sensors.
Inventors
- 👤 Albert Watson Vinal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:29
CPC Classifications
H; H10; H10B; H10B61/00; H10N; H10N52/00; H10N52/101
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
An improved magnetic flux sensor, comprising: a body of semiconductive material having a resistance of at least 500 ohms per square; a source of electrical voltage potential connected to separate contact points on said body, creating an electrical field therebetween of at least 500 volts per centimeter; and an output contact located intermediate said voltage potential contact points on said body, said output providing a voltage output signal whenever said body is intersected by a magnetic flux field having at least some component of flux directed perpendicular to the plane in which said contact points lie.
Claim 2
Dependent Claim
96 words
An improved magnetic flux sensor, comprising: a body of semiconductive material having a resistance of at least 500 ohms per square; a source of electrical voltage potential connected to separate contact points on said body, creating an electrical field therebetween of at least 500 volts per centimeter; and an output contact located intermediate said voltage potential contact points on said body, said output providing a voltage output signal whenever said body is intersected by a magnetic flux field having at least some component of flux directed perpendicular to the plane in which said contact points lie.
Claim 3
Dependent Claim
41 words
Sensor apparatus as described in claim 1, wherein: said body has a resistance in the range of 500 to 100,000 ohms per square; and said electrical field has a strength in the range of from 500 to 100,000 volts per centimeter.
Claim 4
Dependent Claim
40 words
Apparatus as described in claim 1, wherein: said body has a resistance in the range of 5,000 to 20,000 ohms per square; and said electrical field has a strength in the range of from 3,000 to 30,000 volts per centimenter.
Claim 5
Dependent Claim
32 words
Apparatus as described in claim 1, wherein: said body has a resistance of least 1,000 ohms per square; and said electrical field has a strength of at least 1,500 volts per centimeter.
Claim 6
Dependent Claim
28 words
Apparatus as described in claim 1, wherein: said semiconductive body has an impurity level of charged carrier donors or acceptors of less than 10 18 per cubic centimeter.
Claim 7
Dependent Claim
28 words
Apparatus as described in claim 2, wherein: said semiconductive body has an inpurity level of charged carrier donors or acceptors of less than 10 18 per cubic centimeter.
Claim 8
Dependent Claim
28 words
Apparatus as described in claim 3, wherein: said semiconductive body has an impurity level of charged carrier donors or acceptors of less than 10 18 per cubic centimeter.
Claim 9
Dependent Claim
28 words
Apparatus as described in claim 4, wherein: said semiconductive body has an impurity level of charged carrier donors or acceptors of less than 10 18 per cubic centimeter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |