Patent US3223929A successfully refreshed from Google Patents.
US3223929A
Expired / Lapsed
US
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Binary frequency modulation demodulator
Assignee: Ampex Corp
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Filing: 1963-10-03
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Granted: 1965-12-14
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Expires: 1983-10-03
Abstract
No abstract record available.
Inventors
- 👤 Rolf B Hofstad
- 👤 Swyryd Miroslav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/144; H04L27/148
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
APPARATUS FOR DEMODULATING A SIGNAL WHCIH DURING CERTAIN DISCRETE INTERVALS HAS A FIRST FREQUENCY AND DURING OTHER DISCRETE INTERVALS HAS A SECOND FREQUENCY, SAID APPARATUS COMPRISING A FIRST FILTER TURNED TO SAID FIRST FREQUENCY AND HAVING AN INPUT AND AN OUTPUT TERMINAL; A SECOND FILTER TUNED TO SAID SECOND FREQUENCY AND HAVING AN INPUT AND AN OUTPUT TERMINAL; MEANS FOR APPLYING SAID SIGNAL TO SAID FIRST AND SECOND FILTER INPUT TERMINALS; FIRST SIGNALS RECTIFICATION AND INTEGRATION MEANS HAVING AN INPUT AND AN OUTPUT TERMINAL, THE INPUT TERMINAL THEREOF BEING CONNECTED TO SAID FIRST FILTER OUTPUT TERMINAL; SECOND RECTIFICATION AND INTEGRATION MEANS HAVING AN INPUT AND AN OUTPUT TERMINAL, THE INPUT TERMINAL THEREOF BEING CONNECTED TO SAID SECOND FILTER OUTPUT TERMINAL; AND A DIFFERENTIAL AMPLIFIER HAVING FIRST OUTPUT TERMINAL; AND A DIFFERTERMINALS, THE FIRST AND SECOND INPUT TERMINALS THEREOF BEING RESPECTIVELY CONNECTED TO THE OUTPUT TERMINALS OF SIAD FIRST AND SECOND RECTIFICATION AND INTEGRATION MEANS, WHEREIN THE DIFFERENTIJAL AMPLIFIER PROVIDES AMPLIFIED SIGNALS VIA THE OUTPUT TERMINALS THEREOF IN RESPONSE TO THE DIFFERENCE BETWEEN THE SIGNALS INTRODUCED TO THE INPUT TERMINALS THEREOF.
Claim 2
Dependent Claim
180 words
APPARATUS FOR DEMODULATING A SIGNAL WHCIH DURING CERTAIN DISCRETE INTERVALS HAS A FIRST FREQUENCY AND DURING OTHER DISCRETE INTERVALS HAS A SECOND FREQUENCY, SAID APPARATUS COMPRISING A FIRST FILTER TURNED TO SAID FIRST FREQUENCY AND HAVING AN INPUT AND AN OUTPUT TERMINAL; A SECOND FILTER TUNED TO SAID SECOND FREQUENCY AND HAVING AN INPUT AND AN OUTPUT TERMINAL; MEANS FOR APPLYING SAID SIGNAL TO SAID FIRST AND SECOND FILTER INPUT TERMINALS; FIRST SIGNALS RECTIFICATION AND INTEGRATION MEANS HAVING AN INPUT AND AN OUTPUT TERMINAL, THE INPUT TERMINAL THEREOF BEING CONNECTED TO SAID FIRST FILTER OUTPUT TERMINAL; SECOND RECTIFICATION AND INTEGRATION MEANS HAVING AN INPUT AND AN OUTPUT TERMINAL, THE INPUT TERMINAL THEREOF BEING CONNECTED TO SAID SECOND FILTER OUTPUT TERMINAL; AND A DIFFERENTIAL AMPLIFIER HAVING FIRST OUTPUT TERMINAL; AND A DIFFERTERMINALS, THE FIRST AND SECOND INPUT TERMINALS THEREOF BEING RESPECTIVELY CONNECTED TO THE OUTPUT TERMINALS OF SIAD FIRST AND SECOND RECTIFICATION AND INTEGRATION MEANS, WHEREIN THE DIFFERENTIJAL AMPLIFIER PROVIDES AMPLIFIED SIGNALS VIA THE OUTPUT TERMINALS THEREOF IN RESPONSE TO THE DIFFERENCE BETWEEN THE SIGNALS INTRODUCED TO THE INPUT TERMINALS THEREOF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |