US3712833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for descaling oxidized sheet metal
Assignee: Battelle Memorial Institute Inc
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Filing: 1971-07-06
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Granted: 1973-01-23
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Expires: 1991-07-06
Abstract
Abstract SHEET METAL IS SUBSMITTED TO AN EROSIVE SPARKING TREATINGMENT PRECEDING A CONVENTIONAL CHEMICAL DESCALING TREATMENT. THE SPARKING TREATMENT MAY REPLACE THE COVENTIONAL GRAINING TREATMENT. THE APPARATUS INCLUDES A SPARKING DEVICE ARRANGED UPSTREAM OF A CONVENTIONAL CHEMICAL DESCALING BATH AND COMPRISING A PLURAITY OF SPARKING ELEMENTS DISTRIBUTED OVER THE WIDTH OF BOTH FACES OF THE SHEET, AND A GENERATOR FOR FEEDING THE SAID ELEMENTS WITH CURRENT PLUSES PRODUCING ELECTRIC ARCS BETWEEN THEM AND THE SHEET-FACES. IT MAY ALSO COMPRISES A FEEDBACK CONTROL DEVICE FOR ADJUSTING THE FREQUENCY OF THE PULSES IN DEPENDENCE ON THE OBTAINED DEGREE OF DESCALING.
Inventors
- 👤 H Fichaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:59
CPC Classifications
B; B23; B23H; B23H9/00; B21; B21B; B21B45/00; B21B45/04; B21B45/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |