Patent US3589370A successfully refreshed from Google Patents.
Patent US3227955A successfully refreshed from Google Patents.
US3227955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency converter
Assignee: Sony Corp
•
Filing: 1961-03-10
•
Granted: 1966-01-04
•
Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Yasuda Junichi
- 👤 Kubota Yasuharu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:18
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/02; H03D7/04; H03D7/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
A FREQUENCY CONVERTER COMPRISING A PAIR OF TUNNEL DIODE UNITS AND A TAPPED IMPEDANCE ELEMENT SERIALLY CONNECTED WITH ONE ANOTHER TO FORM A LOOP, EACH OF SAID TUNNEL DIODE UNITS INCLUDING A TUNNEL DIODE AND A DIRECT CURRENT BIAS SOURCE, AN INPUT CIRCUIT INCLUDING TWO SOURCES OF ALTERNATING ELECTRIC ENERGY SERIALLY CONNECTED, A LOAD CIRCUIT, ONE OF SAID CIRCUITS BEING CONNECTED BETWEEN THE TAP OF SAID IMPEDANCE ELEMENT AND A POINT BETWEEN SAID TUNNEL DIODE UNITS, THE OTHER OF SAID CIRCUIT BEING ELECTRICALLY COUPLED TO SAID IMPEDANCE ELEMENT, SAID DIODES BEING BIASED TO THE SAME ONE OF TWO POINTS ON RESPECTIVE VOLTAGE-CURRENT CHARACTERISTICS CURVES THEREOF WHERE SUCH CURVES REVERS DIRECTIONS, SAID DIODES BEING CONNECTED IN LIKE POLARITY WITH RESPECT TO SAID LOAD CIRCUIT AND IN REVERSE POLARITY WITH RESPECT TO SAID INPUT CIRCUIT.
References Cited (Backward Citations)
US2608650A
Cited
CH287728A
Cited
US2773979A
Cited
US2978579A
Cited
US3119072A
Cited
US2978576A
Cited
US3148331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |