US3356822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems
Assignee: Vickers Inc
•
Filing: 1966-05-02
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Granted: 1967-12-05
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 Bennett Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
AN ELECTRIC WELDER THAT COMPRISES AN INPUT WHICH IS CONNECTABLE TO A SOURCE OF POLYPHASE A.C., A POLYPHASE TRANSFORMER WHICH HAS THE PRIMARY WINDING THEREOF CONNECTED TO SAID INPUT, OUTPUT TERMINALS THAT ARE CONNECTABLE TO A WELDING LOAD TO SUPPLY POWER TO SAID WELDING LOAD, IMPEDANCES THAT CAN BE INTERPOSED BETWEEN THE SECONDARY WINDING OF SAID POLYPHASE TRANSFORMER AND SAID OUTPUT TERMINALS TO CONTROL THE POWER SUPPLIED TO THE WELDING LOAD BY SAID OUTPUT TERMINALS, AND CONTACTS THAT ARE SELECTIVELY CONNECTABLE TO CAUSE SAID ELECTRIC WELDER TO OPERATE AS A D.C. WELDER OR AS AN A.C. WELDER, SAID IMPEDANCES BEING CONNECTABLE BY SAID CONTACTS TO FORM A POLYPHASE BRIDGE CIRCUIT WHENEVER SAID ELECTRIC WELDER IS OPERATED AS A D.C. WELDER, SAID IMPEDANCES BEING CONNECTABLE IN SERIES BY SAID CONTACTS WHENEVER SAID ELECTRIC WELDER IS OPERATED AS AN A.C. WELDER.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |