US3205457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-balanced modulator
Assignee: Bell and Howell Co
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Filing: 1961-10-19
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Granted: 1965-09-07
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Norton W Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/56; H03C1/58
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
A MODULATOR DEMODULATOR CIRCUIT COMPRISING: MEANS CONNECTED TO A COMMON REFERENCE POTENTIAL POINT FOR DEVELOPING FIRST AND SECOND ALTERNATING VOLTAGE SIGNALS WHICH ARE OUT-OF-PHASE WITH EACH OTHER RELATIVE TO THE REFERENCE POINT; FIRST AND SECOND IMPEDANCE MEANS OF EQUAL VALUE COUPLED IN SERIES WITH EACH OTHER; OUTPUT MEANS INCLUDING A FIRST OUTPUT TERMINAL COUPLED TO THE SERIES JUNCTION OF THE FIRST AND SECOND IMPEDANCE MEANS AND A SECOND OUTPUT TERMINAL CONNECTED TO THE REFERENCE POINT; MEANS CONNECTING OPPOSITE ENDS OF THE SERIES CONNECTED IMPEDANCES ACROSS THE VOLTAGE DEVELOPING MEANS SUCH THAT THE VOLTAGE ACROSS THE SERIES IMPEDANCES IS THE SUM OF THE FIRST AND SECOND ALTERNATING VOLTAGE SIGNALS, AND SWITCHING MEANS FOR ALTERNATELY CONNECTING THE OPPOSITE ENDS OF THE SERIES CONNECTED IMPEDANCES TO THE REFERENCE POTENTIAL POINT.
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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |