US3317819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic hum and ripple filter
Assignee: Individual
•
Filing: 1963-10-03
•
Granted: 1967-05-02
•
Expires: 1983-10-03
Abstract
No abstract record available.
Inventors
- 👤 Earle C Brodie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
A TRANSISTOR FILTER CIRCUIT INCLUDING A PLURALITY OF STAGES, EACH STAGE HAVING INPUT AND OUTPUT ELECTRODES CONNECTED IN SERIES BETWEEN INPUT AND OUTPUT TERMINALS OF ONE POLARITY AND A COMMON VOLTAGE LINE OF THE OPPOSITE POLARITY COUPLED IN PARALLEL TO CONTROL ELECTRODES OF SAID STAGES, WHEREIN THE IMPROVEMENT COMPRISES A BIASING RESISTOR CONNECTING THE CONTROL ELECTRODE IN EACH STAGE ONLY TO ONE OF THE INPUT AND OUTPUT ELECTRODES RENDERING THE STAGE CONDUCTIVE WITH A MINIMUM POTENTIAL DIFFERENCE BETWEEN THE INPUT AND OUTPUT ELECTRODES, AND SIGNAL COUPLING CAPACITORS CONNECTED IN PARALLEL BETWEEN THE CONTROL ELECTRODES AND THE COMMON VOLTAGE LINE TO VARY THE CONDUCTANCE OF EACH STAGE IN ACCORDANCE WITH VOLTAGE DEVIATIONS BETWEEN THE INPUT TERMINAL AND THE COMMON VOLTAGE LINE TO PROVIDE SUBSTANTIALLY EQUAL ATTENUATION RATIOS THROUGH SAID STAGES.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |