Patent US3594302A successfully refreshed from Google Patents.
US3594302A
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Apparatus for improving the chemicothermal surface treatment of tubes
Assignee: Elektrophysikalische Anstalt Bernhard Berghaus
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Filing: 1968-06-10
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Granted: 1971-07-20
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Expires: 1988-06-10
Abstract
Abstract AN APPARATUS FOR HARDENING TUBULAR WORKPIECE BY ELECTRICAL GLOW DISCHARGE IN A GAS ATMOSPHERE. GAS IS DELIVERED INTO A GLOW DISCHARGE CHAMBER THROUGH A PIPE FUNCTIONING AS AN ANODE AND DISCHARGING GAS WITHIN THE TUBULAR WORKPIECE, GENERALLY MIDWAY OF ITS ENDS, THROUGH OPENINGS IN THE PIPE. BAFFLE MEANS FURTHER DEFLECT THE GAS TO EFFECT EFFICIENT DISTRIBUTION THEREOF OVER THE INTERIOR SURFACE OF THE WORKPIECE, WHICH IS CONNECTED AS A CATHODE.
Inventors
- 👤 Horst Edmund Rordorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:38
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32431; H01J37/3244; B; B01; B01J; B01J19/00; B01J19/08; B01J19/087; B01J19/088; C; C23; C23C; C23C8/00; C23C8/06; C23C8/36; F; F41; F41A; F41A21/00; F41A21/22
Claims Analysis
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |