US3209250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for inverse fourier analysis of electrical transients
Assignee: ExxonMobil Upstream Research Co
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Filing: 1959-10-26
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Granted: 1965-09-28
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Expires: 1979-10-26
Abstract
No abstract record available.
Inventors
- 👤 Kay N Burns
- 👤 Wallace L Ikard
- 👤 Jesse D Skelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:39
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD FOR OBTAINING THE INVERSE FOURIER TRANSFORM OF A COMPLEX ELECTRICAL FREQUENCY FUNCTION WHICH COMPRISES SAMPLING A SINE WAVE OF KNOWN FREQUENCY AT REGULAR DELAYED TIME INTERVALS WHOSE FREQUENCY EXCEEDS THE KNOWN FREQUENCY OF SAID SINE WAVE BY A FACTOR OF AT LEAST TWO, ATTENUATING THE DELAYED SAMPLES IN PROPORTION TO THE AMPLITUDE VALUES OF SAID FREQUENCY FUNCTION AT FREQUENCY INTERVALS CORRESPONDING TO THE KNOWN FREQUENCY OF SAID SINE WAVE BY PASSIN EACH OF SAID SAMPLES THROUGH ONE OF A PLURALITY OF RESISTANCE ELEMENTS, AND COMBINING THE ATTENUATED SAMPLES TO OBTAIN A COMPOSITE SIGNAL REPRESENTING SAID INVERSE FOURIER TRANSFORM.
Claim 2
Independent Claim
100 words
A METHOD FOR OBTAINING THE INVERSE FOURIER TRANSFORM OF A COMPLEX ELECTRICAL FREQUENCY FUNCTION WHICH COMPRISES SAMPLING A SINE WAVE OF KNOWN FREQUENCY AT REGULAR DELAYED TIME INTERVALS WHOSE FREQUENCY EXCEEDS THE KNOWN FREQUENCY OF SAID SINE WAVE BY A FACTOR OF AT LEAST TWO, ATTENUATING THE DELAYED SAMPLES IN PROPORTION TO THE AMPLITUDE VALUES OF SAID FREQUENCY FUNCTION AT FREQUENCY INTERVALS CORRESPONDING TO THE KNOWN FREQUENCY OF SAID SINE WAVE BY PASSIN EACH OF SAID SAMPLES THROUGH ONE OF A PLURALITY OF RESISTANCE ELEMENTS, AND COMBINING THE ATTENUATED SAMPLES TO OBTAIN A COMPOSITE SIGNAL REPRESENTING SAID INVERSE FOURIER TRANSFORM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |