US3144627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding transformer with colled core
Assignee: WELDEX DIVISION OF METAL CRAFT
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Filing: 1960-07-05
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Granted: 1964-08-11
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Expires: 1980-07-05
Abstract
No abstract record available.
Inventors
- 👤 Donald F Dunnabeck
- 👤 Arthur W Bull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A CORE FOR A WELDING STEPDOWN TRANSFORMER ADAPTED TO RECEIVE NON-SINUSOIDAL POWER PULSES IN ITS PRIMARY, COMPRISING: A PAIR OF IDENTICAL STACKS OF THIN MAGNETIC LAMINATIONS ENCLOSING TWO SPACE AREAS SO AS TO FORM TWO SEPARATE MAGNETIC PATHS HAVING A SINGLE COMMON LEG AND TWO NON-COMMON LEGS; A SOLID CORE PART FORMED OF TWO IDENTICAL PIECES OF NON-MAGNETIC MATERIAL SHAPED SIMILARLY TO SAID LAMINATION STACKS BUT DIFFERING THEREFROM IN HAVING AN AIR GAP IN EACH OF SAID NON-COMMON LEGS AND AN INSULATING PARTITION IN SAID COMMON LEG; COOLING PASSAGES IN EACH OF SAID SOLID CORE PART HALVES CONNECTING AT SAID PARTITION IN SAID COMMON LEG; AND FASTENER MEANS FOR DISPOSING SAID LAMINATION STACKS ON THE OPPOSITE SIDES OF SAID SOLID CORE PART AND IN AN ABUTTING RELATIONSHIP THERETO.
Claim 2
Dependent Claim
128 words
A CORE FOR A WELDING STEPDOWN TRANSFORMER ADAPTED TO RECEIVE NON-SINUSOIDAL POWER PULSES IN ITS PRIMARY, COMPRISING: A PAIR OF IDENTICAL STACKS OF THIN MAGNETIC LAMINATIONS ENCLOSING TWO SPACE AREAS SO AS TO FORM TWO SEPARATE MAGNETIC PATHS HAVING A SINGLE COMMON LEG AND TWO NON-COMMON LEGS; A SOLID CORE PART FORMED OF TWO IDENTICAL PIECES OF NON-MAGNETIC MATERIAL SHAPED SIMILARLY TO SAID LAMINATION STACKS BUT DIFFERING THEREFROM IN HAVING AN AIR GAP IN EACH OF SAID NON-COMMON LEGS AND AN INSULATING PARTITION IN SAID COMMON LEG; COOLING PASSAGES IN EACH OF SAID SOLID CORE PART HALVES CONNECTING AT SAID PARTITION IN SAID COMMON LEG; AND FASTENER MEANS FOR DISPOSING SAID LAMINATION STACKS ON THE OPPOSITE SIDES OF SAID SOLID CORE PART AND IN AN ABUTTING RELATIONSHIP THERETO.
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |