US3342250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for vacuum melting and teeming steel and steellike alloys
Assignee: Krupp Stahl AG
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Filing: 1964-11-09
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Granted: 1967-09-19
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Expires: 1984-11-09
Abstract
No abstract record available.
Inventors
- 👤 Treppschuh Helmut
- 👤 Robert L Hentrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:47
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/14; C; C21; C21C; C21C7/00; C21C7/0081; C21C7/10; C22; C22B; C22B9/00; C22B9/04; C22B9/16; C22B9/22; C22B9/226; C22B9/228; F; F27; F27B; F27B3/00; F27B3/06; F27B3/065; F27B3/10; F27B3/18; F27B3/183; F27B3/186; F27B3/20; F27D; F27D11/00; F27D11/02; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0026; F27D2099/0031
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD OF REFINING METALS, ESPECIALLY STEEL AND ALLOYS, WHICH INCLUDES THE STEPS OF: IN A VACUUM PURELY ELECTRON HEATING THE MELT TO BE REFINED FOR ELIMINATING VOLATILIZABLE IMPURITIES BY EVAPORATION AND SUBSEQUENTLY STOPPING THE SAID ELECTRON HEATING AND SUBJECTING THE THUS TREATED MELT TO A HEATING AT LEAST PARTIALLY BY ION BEAMS.
Claim 2
Independent Claim
138 words
AN APPARATUS FOR REFINING METALS, ESPECIALY STEEL AND ALLOYS, WHICH INCLUDES: CLOSED VACUUM-TIGHT FURNACE MEANS, CRUCIBLE MEANS ARRANGED WITHIN SAID FURNACE MEANS AND ADAPTED TO RECEIVE MATERIAL TO BE REFINED, FIRST MATERIAL SUPPLY MEANS ADAPTED TO BE CONNECTED TO SAID CRUCIBLE MEANS FOR FURNISHING THERETO THE BASIC MATERIAL TO BE REFINED, SECOND MATERIAL SUPPLY MEANS ADAPTED SELECTIVELY TO BE CONNECTED TO SAID CRUCIBLE MEANS FOR CONVEYING ALLOYING CONSTITUENTS THERETO, GAS EXHAUST CONDUIT MEANS ASSOCIATED WITH AID FURNACE MEANS FOR SELECTIVELY CREATING THEREIN AN ABSOLUTE PRESSURE OF NOT EXCEEDING 100 MILLITORRS, ELECTRON HEATIN MEANS CONNECTED TO SAID FURNACE MEANS FOR SELECTIVE ELECTRON HEATIN THE CONTENTS IN SAID CRUCIBLE MEANS, AND PLASMA HEATING MEANS LIKEWISE ASSICIATED WITH SAID FURNACE MEANS AND OPERABLE SELECTIVELY TO BE MADE EFFECTIVE AND INEFFECTIVE FOR SELECTIVE PLASMA HEATING OF THE CONTENTS OF SAID CRUCIBLE MEANS.
References Cited (Backward Citations)
US3183077A
Cited
US3257197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |