US3267368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic field sensing device
Assignee: Varian Medical Systems Inc
•
Filing: 1963-01-21
•
Granted: 1966-08-16
•
Expires: 1983-01-21
Abstract
No abstract record available.
Inventors
- 👤 John V Rock
- 👤 David L Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:43
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/07; G05; G05F; G05F7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
AN APPARATUS FOR SENSING THE STRENGTH OF A MAGNETIC FIELD WITH VERY HIGH PRECISION COMPRISING HALL-EFFECT SENSING MEANS ADAPTED TO GENERATE A HALL VOLTAGE WHEN DISPOSED WITHIN A MAGNETIC FIELD IN VARIABLE ACCORDANCE THEREWITH AND HIGH PRECISION VOLTAGE DIVIDING MEANS BEING CONNECTED IN SERIES CIRCUIT RELATION TO AT LEAST ONE CURRENT LEAD OF SAID HALL SENSING MEANS, A VARIABLE CALIBRATED REFERENCE VOLTAGE BEING GENERATED ACROSS SAID DIVIDING MEANS IN SERIES OPPOSING FASHING TO SAID HALL VOLTAGE TO PRODUCE A DIFFERENCE SIGNAL THEREBETWEEN WHEREBY A VOLTAGE EQUAL TO THE HALL VOLTAGE IS DERIVED AND DEVIATIONS FROM THE STEADY STATE LINEAR RELATION OF SAID MAGNETIC FIELD STRENGTH TO SAID HALL VOLTAGE DUE TO EXTERNAL FLUCTUATIONS IN SUPPLY VOLTAGE AND CIRCUIT LOADING ARE EFFECTIVELY CANCELLED, WHEREIN SAID VOLTAGE DIVIDING MEANS COMPRISES A FIRST HIGH PRECISION RESISTOR, AND SAID HALL SENSING MEANS HAS TWO VOLTAGE LEADS OPPOSITELY DISPOSED IN THE PLANE OF SAID
Claim 2
Independent Claim
149 words
AN APPARATUS FOR SENSING THE STRENGTH OF A MAGNETIC FIELD WITH VERY HIGH PRECISION COMPRISING HALL-EFFECT SENSING MEANS ADAPTED TO GENERATE A HALL VOLTAGE WHEN DISPOSED WITHIN A MAGNETIC FIELD IN VARIABLE ACCORDANCE THEREWITH AND HIGH PRECISION VOLTAGE DIVIDING MEANS BEING CONNECTED IN SERIES CIRCUIT RELATION TO AT LEAST ONE CURRENT LEAD OF SAID HALL SENSING MEANS, A VARIABLE CALIBRATED REFERENCE VOLTAGE BEING GENERATED ACROSS SAID DIVIDING MEANS IN SERIES OPPOSING FASHING TO SAID HALL VOLTAGE TO PRODUCE A DIFFERENCE SIGNAL THEREBETWEEN WHEREBY A VOLTAGE EQUAL TO THE HALL VOLTAGE IS DERIVED AND DEVIATIONS FROM THE STEADY STATE LINEAR RELATION OF SAID MAGNETIC FIELD STRENGTH TO SAID HALL VOLTAGE DUE TO EXTERNAL FLUCTUATIONS IN SUPPLY VOLTAGE AND CIRCUIT LOADING ARE EFFECTIVELY CANCELLED, WHEREIN SAID VOLTAGE DIVIDING MEANS COMPRISES A FIRST HIGH PRECISION RESISTOR, AND SAID HALL SENSING MEANS HAS TWO VOLTAGE LEADS OPPOSITELY DISPOSED IN THE PLANE OF SAID
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |