US3311784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preignition prevention in ignitrons by delayed application to the auxiliary anode
Assignee: Westinghouse Electric Corp
•
Filing: 1963-11-14
•
Granted: 1967-03-28
•
Expires: 1983-11-14
Abstract
No abstract record available.
Inventors
- 👤 Louis A Casanova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:54
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
IN COMBINATION, A RECTIFIER TUBE OF THE TYPE HAVING AN ANODE, CATHODE, IGNITOR, AUXILIARY ANODE, AND GRID MEANS; A SOURCE OF NEGATIVE UNIDIRECTIONAL POTENTIAL CONNECTED IN CIRCUIT RELATION WITH SAID GRID MEANS; A SOURCE OF ALTERNATING POTENTIAL; A LOAD CIRCUIT; SAID SOURCE OF ALTERNATING POTENTIAL, LOAD CIRCUIT, ANODE, AND CATHODE BEING CONNECTED IN SERIES CIRCUIT RELATION; SWITCHING MEANS HAVING TWO MAIN ELECTRODES AND A CONTROL ELECTRODE; THE MAIN ELECTRODES OF SAID SWITCHING MEANS BEING CONNECTED IN SERIES CIRCUIT RELATION WITH THE AUXILIARY ANODE OF SAID RECTIFIER TUBE AND SAID SOURCE OF ALTERNATING POTENTIAL; FIRING MEANS CONNECTED IN CIRCUIT RELATION WITH SAID IGNITOR PROVIDING A FIRST SIGNAL FOR INITIATING ELECTRON EMISSION FROM SAID CATHODE; MEANS CONNECTED IN CIRCUIT RELATION WITH SAID IGNITOR AND THE CONTROL ELECTRODE OF SAID SWITCH-
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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |