Patent US3274488A successfully refreshed from Google Patents.
US3274488A
Expired / Lapsed
US
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Apparatus for measuring magnetic intensity with compensation for diurnal variations
Assignee: Individual
•
Filing: 1963-03-22
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Granted: 1966-09-20
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Expires: 1983-03-22
Abstract
No abstract record available.
Inventors
- 👤 Washkurak Stephen
- 👤 Sawatzky Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:24
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/025; G01V; G01V3/00; G01V3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
MAGNETIC INTENSITY SURVEY APPARATUS COMPRISING A MOBILE SURVEY MAGNETOMETER ADAPTED TO PRODUCE A SIGNAL OF WHICH THE FREQUENCY FS IS INDICATIVE OF MAGNETIC INTENSITY IN THE VICINITY OF THE SURVEY MAGNETOMETER, A CONTROL MAGNETOMETER FOR USE AT A LOCATION REMOTE FROM THAT OF THE SURVEY MAGNETOMETER AND ADAPTED TO PRODUCE A SIGNAL OF WHICH THE FREQUENCY FC IS INDICATIVE OF DIURNAL VARIATIONS IN MAGNETIC INTENSITY, A SOURCE OF A STABLE REFERENCE SIGNAL HAVING A FREQUENCY FR, FIRST MIXER MEANS HAVING INPUT CONNECTIONS TO THE CONTROL MAGNETOMETER AND TO THE SOURCE OF STABLE REFERENCE SIGNAL AND ADAPTED TO PRODUCE AT ITS OUTPUT A SIGNAL OF FREQUENCY FD EQUAL TO FC MINUS FR, SECOND MIXER MEANS HAVING INPUT CONNECTIONS TO THE OUTPUT OF THE FIRST MIXER MEANS AND TO THE OUTPUT OF TELEMETER MEANS ADAPTED TO TRANSMIT THE SIGNAL FROM SAID MOBILE SURVEY MAGNETOMETER, SAID SECOND MIXER MEANS BEING ADAPTED TO PRODUCE AT ITS OUTPUT A SIGNAL OF FREQUENCY FT EQUAL TO FS MINUS FD, AND MEANS ADAPTED TO INDICATE THE FREQUENCY FT OF THE OUTPUT SIGNAL OF THE SECOND MIXER MEANS.
Claim 2
Dependent Claim
180 words
MAGNETIC INTENSITY SURVEY APPARATUS COMPRISING A MOBILE SURVEY MAGNETOMETER ADAPTED TO PRODUCE A SIGNAL OF WHICH THE FREQUENCY FS IS INDICATIVE OF MAGNETIC INTENSITY IN THE VICINITY OF THE SURVEY MAGNETOMETER, A CONTROL MAGNETOMETER FOR USE AT A LOCATION REMOTE FROM THAT OF THE SURVEY MAGNETOMETER AND ADAPTED TO PRODUCE A SIGNAL OF WHICH THE FREQUENCY FC IS INDICATIVE OF DIURNAL VARIATIONS IN MAGNETIC INTENSITY, A SOURCE OF A STABLE REFERENCE SIGNAL HAVING A FREQUENCY FR, FIRST MIXER MEANS HAVING INPUT CONNECTIONS TO THE CONTROL MAGNETOMETER AND TO THE SOURCE OF STABLE REFERENCE SIGNAL AND ADAPTED TO PRODUCE AT ITS OUTPUT A SIGNAL OF FREQUENCY FD EQUAL TO FC MINUS FR, SECOND MIXER MEANS HAVING INPUT CONNECTIONS TO THE OUTPUT OF THE FIRST MIXER MEANS AND TO THE OUTPUT OF TELEMETER MEANS ADAPTED TO TRANSMIT THE SIGNAL FROM SAID MOBILE SURVEY MAGNETOMETER, SAID SECOND MIXER MEANS BEING ADAPTED TO PRODUCE AT ITS OUTPUT A SIGNAL OF FREQUENCY FT EQUAL TO FS MINUS FD, AND MEANS ADAPTED TO INDICATE THE FREQUENCY FT OF THE OUTPUT SIGNAL OF THE SECOND MIXER MEANS.
References Cited (Backward Citations)
US2996657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |