US3348153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-shift receiver insensitive to distortion and selective fading
Assignee: International Business Machines Corp
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Filing: 1964-02-17
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Granted: 1967-10-17
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 John R Featherston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN A FSK RECEIVER HAVING MARK AND SPACE CHANNELS EACH CONNECTED TO AN INPUT OF A DECISION BISTABLE STATE CIRCUIT, MEANS CONNECTED IN THE CHANNELS TO PROVIDE SIGNALS FOR THE DECISION CIRCUIT IN THE ABSENCE OF EITHER MARK OR SPACE SIGNALS, COMPRISING: A FIRST CIRCUIT RESPONSIVE TO THE MARK SIGNAL TO GENERATE ITS COMPLEMENT; A SECOND CIRCUIT RESPONSIVE TO THE SPACE SIGNAL TO GENERATE ITS COMPLEMENT; A FIRST GATE RESPONSIVE TO THE MARK SIGNAL AND THE COMPLEMENT OF THE SPACE SIGNAL TO GENERATE A SIGNAL WHEN EITHER APPEARS; A SECOND GATE RESPONSIVE TO THE SPACE SIGNAL AND THE NAL WHEN EITHER APPEARS; NAL WHEN EITHER APPEARS; MEANS TO CONNECT THE OUTPUT FROM SAID RIST GATE TO ONE INPUT OF THE DECISION CIRCUIT; AND MEANS TO CONNECT THE OUTPUT FROM SAID SECOND GATE TO THE OTHER INPUT OF THE DECISION CIRCUIT.
Claim 2
Dependent Claim
140 words
IN A FSK RECEIVER HAVING MARK AND SPACE CHANNELS EACH CONNECTED TO AN INPUT OF A DECISION BISTABLE STATE CIRCUIT, MEANS CONNECTED IN THE CHANNELS TO PROVIDE SIGNALS FOR THE DECISION CIRCUIT IN THE ABSENCE OF EITHER MARK OR SPACE SIGNALS, COMPRISING: A FIRST CIRCUIT RESPONSIVE TO THE MARK SIGNAL TO GENERATE ITS COMPLEMENT; A SECOND CIRCUIT RESPONSIVE TO THE SPACE SIGNAL TO GENERATE ITS COMPLEMENT; A FIRST GATE RESPONSIVE TO THE MARK SIGNAL AND THE COMPLEMENT OF THE SPACE SIGNAL TO GENERATE A SIGNAL WHEN EITHER APPEARS; A SECOND GATE RESPONSIVE TO THE SPACE SIGNAL AND THE NAL WHEN EITHER APPEARS; NAL WHEN EITHER APPEARS; MEANS TO CONNECT THE OUTPUT FROM SAID RIST GATE TO ONE INPUT OF THE DECISION CIRCUIT; AND MEANS TO CONNECT THE OUTPUT FROM SAID SECOND GATE TO THE OTHER INPUT OF THE DECISION CIRCUIT.
References Cited (Backward Citations)
US3238459A
Cited
US3244986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |