US3300683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding apparatus
Assignee: Boeing Co
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Filing: 1964-01-06
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Granted: 1967-01-24
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Expires: 1984-01-06
Abstract
No abstract record available.
Inventors
- 👤 Robert J Weishaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:39
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; B23K9/1012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A WELDING APPARATUS COMPRISING IN COMBINATION: A LOAD CIRCUIT; DIRECT CURRENT SUPPLY MEANS; A FIRST CURRENT GATE HAVING A CONDUCTIVE AND A NONCONDUCTIVE CONDITION CONNECTED TO SAID SUPPLY MEANS AND TO SAID LOAD CIRCUIT AND ADAPTED WHEN IN ITS CONDUCTIVE CONDITION TO PROVIDE CURRENT FLOW THROUGH SAID CIRCUIT IN A FIRST DIRECTION; A SECOND CURRENT GATE HAVING A CONDUCTIVE AND A NONCONDUCTIVE CONDITION CONNECTED TO SAID SUPPLY MEANS AND TO SAID LOAD CIRCUIT AND ADAPTED WHEN IN ITS CONDUCTIVE CONDITION TO PROVIDE CURRENT FLOW THROUGH SAID CIRCUIT IN A SECOND DIRECTION OPPOSITE TO SAID FIRST DIRECTION; A FIRST FEEDBACK CIRCUIT COUPLED WITH SAID LOAD CIRCUIT AND WITH SAID SECOND CURRENT GATE RESPONSIVE TO THE TERMINATION OF CURRENT FLOW IN SAID FIRST DIRECTION
Claim 2
Dependent Claim
122 words
A WELDING APPARATUS COMPRISING IN COMBINATION: A LOAD CIRCUIT; DIRECT CURRENT SUPPLY MEANS; A FIRST CURRENT GATE HAVING A CONDUCTIVE AND A NONCONDUCTIVE CONDITION CONNECTED TO SAID SUPPLY MEANS AND TO SAID LOAD CIRCUIT AND ADAPTED WHEN IN ITS CONDUCTIVE CONDITION TO PROVIDE CURRENT FLOW THROUGH SAID CIRCUIT IN A FIRST DIRECTION; A SECOND CURRENT GATE HAVING A CONDUCTIVE AND A NONCONDUCTIVE CONDITION CONNECTED TO SAID SUPPLY MEANS AND TO SAID LOAD CIRCUIT AND ADAPTED WHEN IN ITS CONDUCTIVE CONDITION TO PROVIDE CURRENT FLOW THROUGH SAID CIRCUIT IN A SECOND DIRECTION OPPOSITE TO SAID FIRST DIRECTION; A FIRST FEEDBACK CIRCUIT COUPLED WITH SAID LOAD CIRCUIT AND WITH SAID SECOND CURRENT GATE RESPONSIVE TO THE TERMINATION OF CURRENT FLOW IN SAID FIRST DIRECTION
References Cited (Backward Citations)
US2951930A
Cited
US3068352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |