Patent US3553535A successfully refreshed from Google Patents.
US3553535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: Fritz Hellige und Co GmbH
•
Filing: 1968-02-19
•
Granted: 1971-01-05
•
Expires: 1988-02-19
Abstract
Abstract A SWITCHING CIRCUIT FOR CONTROLLING ALTERNATING CURRENT RELAYS OR DIRECT CURRENT RAYS UTILIZING A CONTROLLED CURRENT-RECTIFIER IN SERIES WITH A PARALLEL ARRANGEMENT OF A HOLDING CHOKE AND A DIODE. A PULSATING DIRECT CURRENT SOURCE IS UTILIZED TO IGNITE THE CONTROLLED CURRENT-RECTIFIER AND A PARALLEL CIRCUIT OF THE HOLDING CHOKE AND DIODE COOPERATES WITH THE CONTROLLED CURRENT-RECTIFIER TO ENSURE THAT THE RECTIFIER IS CONDUCTIVE DURING CERTAIN SHORT TERM INTERVALS, SUCH AS INTERRUPTIONS OF THE IGNITION VOLTAGE OR WHEN THE CURRENT WOULD TEND TO FALL BELOW THE THRESHOLD VALUE.
Inventors
- 👤 Paul A Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:24
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K5/00; H03K5/01; H03K5/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |