US3165709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency selection circuit, particularly for call receivers
Assignee: Autophon AG
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Filing: 1960-12-13
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Granted: 1965-01-12
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Expires: 1980-12-13
Abstract
No abstract record available.
Inventors
- 👤 Blochlinger Hans
- 👤 Kauffungen Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:56
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1638
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A FREQUENCY SELECTION CIRCUIT OF THE CHARACTER DESCRIBED COMPRISING FIRST MEANS TO RECEIVE AN ALTERNATING CURRENT INPUT SIGNAL TO CONVERT SUCH INPUT SIGNAL INTO A FIRST SQUARE WAVE, SECOND MEANS COMPRISING AN OSCILLATOR PRODUCING A SECOND SQUARE WAVE AND ADAPTED TO BE SYNCHRONIZED IN PHASE-LOCKED RELATION BY AN EXTERNAL PERIODIC SIGNAL APPROXIMATELY OF THE SAME FREQUENCY AS THE NATURAL FREQUENCY OF THE OSCILLATOR, THIRD MEANS COUPLING SAID FIRST MEANS TO SAID SECOND MEANS SO AS TO SYNCHRONIZE SAID OSCILLATOR, AND FOURTH MANS TO RECTIFY AND SUPERIMPOSE SAID FIRST AND SECOND SQUARE WAVES AND TO DERIVE THEREFROM A RESULTANT OUTPUT SIGNAL OF AT LEAST APPROXIMATELY CONTINUOUS DURATION WHEN THE FREQUENCY OF THE EXTERNAL SIGNAL IS SO NEAR TO THE NATURAL FREQUENCY OF SAID OSCILLATOR THAT SAID OSCILLATOR IS SYNCHRONIZED BY THE EXTERNAL SIGNAL.
Claim 2
Dependent Claim
132 words
A FREQUENCY SELECTION CIRCUIT OF THE CHARACTER DESCRIBED COMPRISING FIRST MEANS TO RECEIVE AN ALTERNATING CURRENT INPUT SIGNAL TO CONVERT SUCH INPUT SIGNAL INTO A FIRST SQUARE WAVE, SECOND MEANS COMPRISING AN OSCILLATOR PRODUCING A SECOND SQUARE WAVE AND ADAPTED TO BE SYNCHRONIZED IN PHASE-LOCKED RELATION BY AN EXTERNAL PERIODIC SIGNAL APPROXIMATELY OF THE SAME FREQUENCY AS THE NATURAL FREQUENCY OF THE OSCILLATOR, THIRD MEANS COUPLING SAID FIRST MEANS TO SAID SECOND MEANS SO AS TO SYNCHRONIZE SAID OSCILLATOR, AND FOURTH MANS TO RECTIFY AND SUPERIMPOSE SAID FIRST AND SECOND SQUARE WAVES AND TO DERIVE THEREFROM A RESULTANT OUTPUT SIGNAL OF AT LEAST APPROXIMATELY CONTINUOUS DURATION WHEN THE FREQUENCY OF THE EXTERNAL SIGNAL IS SO NEAR TO THE NATURAL FREQUENCY OF SAID OSCILLATOR THAT SAID OSCILLATOR IS SYNCHRONIZED BY THE EXTERNAL SIGNAL.
References Cited (Backward Citations)
FR1244757A
Cited
US3010073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-12 | 1968-07-13 | 1969-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-12 | 1972-07-13 | 1973-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-12 | 1976-07-13 | 1977-01-12 | $7700.00 | Window Closed / Lapsed |