Patent US3328686A successfully refreshed from Google Patents.
US3328686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.c. analog spectrum analyzer
Assignee: Weston Instruments Inc
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Filing: 1964-08-31
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Granted: 1967-06-27
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Abraham M Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:58
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A NON-SCANNED ANALYZER FOR DERIVING THE REAL AND IMAGINARY FOURIER TRANSFORMS OF AN INPUT SIGNAL F(T) OVER AN INTERVAL 0$T$T, S NON-SCANNED OSCILLATOR DERIVING OUT OF PHASE OSCILLATIONS SIN W0T AND COS W0T, SAID OSCILLATOR INCLUDING A PAIR OF INTEGRATORS CONNECTED IN A POSITIVE FEEDBACK NETWORK, MEANS FOR SETTING SAID INTEGRATORS AT T=0 SO SAID SIN W0T AND COS W0T OSCILLATIONS ARE DERIVED SUBSTANTIALLY WITHOUT TRANSIENTS, A FIRST MULTIPLIER RESPONSIVE TO F(T) AND SIN W0T, A SECOND MULTIPLIER RESPONSIVE TO F(T) AND SIN W0T, AND MEANS RESPONSIVE TO OUTPUTS OF SAID MULTIPLIERS FOR DERIVING SAID TRANSFORMS.
Claim 2
Dependent Claim
97 words
IN A NON-SCANNED ANALYZER FOR DERIVING THE REAL AND IMAGINARY FOURIER TRANSFORMS OF AN INPUT SIGNAL F(T) OVER AN INTERVAL 0$T$T, S NON-SCANNED OSCILLATOR DERIVING OUT OF PHASE OSCILLATIONS SIN W0T AND COS W0T, SAID OSCILLATOR INCLUDING A PAIR OF INTEGRATORS CONNECTED IN A POSITIVE FEEDBACK NETWORK, MEANS FOR SETTING SAID INTEGRATORS AT T=0 SO SAID SIN W0T AND COS W0T OSCILLATIONS ARE DERIVED SUBSTANTIALLY WITHOUT TRANSIENTS, A FIRST MULTIPLIER RESPONSIVE TO F(T) AND SIN W0T, A SECOND MULTIPLIER RESPONSIVE TO F(T) AND SIN W0T, AND MEANS RESPONSIVE TO OUTPUTS OF SAID MULTIPLIERS FOR DERIVING SAID TRANSFORMS.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |