Patent US3087047A successfully refreshed from Google Patents.
US3087047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precharging capacitor for pulse power
Assignee: ROHOTRON Corp
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Filing: 1960-08-01
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Granted: 1963-04-23
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Expires: 1980-08-01
Abstract
No abstract record available.
Inventors
- 👤 Stuart C Rockafellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:43
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A CIRCUIT FOR SUPPLYING PULSES OF ENERGY TO WELDING ELECTRODES, COMPRISING: A SOURCE OF ALTERNATING POTENTIAL; A WELDING TRANSFORMER HAVING A PRIMARY WINDING AND HAVING A SECONDARY WINDING CONNECTED TO WELDING ELECTRODES; A PAIR OF BACK-TO-BACK CONNECTED ELECTRIC VALVES HAVING CONTROL ELECTRODES; A CAPACITOR, SAID CAPACITOR, SAID VALVES AND SAID PRIMARY WINDING BEING CONNECTED IN SERIES WITH EACH OTHER; WELD TIMER MEANS CONNECTED TO SAID CONTROL ELECTRODES FOR RENDERING SAID VALVES CONDUCTIVE ON OPPOSITE HALF-CYCLES OF SAID ALTERNATING SOURCE; A VARIABLE TRANSFORMER HAVING A SECONDARY WINDING, ONE OF WHOSE ENDS IS
Claim 2
Dependent Claim
91 words
A CIRCUIT FOR SUPPLYING PULSES OF ENERGY TO WELDING ELECTRODES, COMPRISING: A SOURCE OF ALTERNATING POTENTIAL; A WELDING TRANSFORMER HAVING A PRIMARY WINDING AND HAVING A SECONDARY WINDING CONNECTED TO WELDING ELECTRODES; A PAIR OF BACK-TO-BACK CONNECTED ELECTRIC VALVES HAVING CONTROL ELECTRODES; A CAPACITOR, SAID CAPACITOR, SAID VALVES AND SAID PRIMARY WINDING BEING CONNECTED IN SERIES WITH EACH OTHER; WELD TIMER MEANS CONNECTED TO SAID CONTROL ELECTRODES FOR RENDERING SAID VALVES CONDUCTIVE ON OPPOSITE HALF-CYCLES OF SAID ALTERNATING SOURCE; A VARIABLE TRANSFORMER HAVING A SECONDARY WINDING, ONE OF WHOSE ENDS IS
References Cited (Backward Citations)
US2256209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |