US2867558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing grain-oriented silicon steel
Assignee: General Electric Co
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Filing: 1956-12-31
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Granted: 1959-01-06
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 John E May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; C21D8/1244; C21D8/1266; C21D8/1272
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD OF FABRICATING POLYCRYSTALLINE SHEET-LIKE BODIES OF METAL COMPRISING ELECTRICAL GRADE SILICON-IRON ALLOY CONSISTING ESSENTIALLY OF FROM ABOUT 2.5 TO 4.0 PERCENT SILICON, MORE THAN ABOUT 0.012 PERCENT SULFUR, A SUFFICIENT AMOUNT OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF MANGANESE, TITANIUM AND CHROMIUM TO COMBINE WITH THE SULFUR TO FORM SULFIDE AND THE BALANCE SUBSTANTIALLY ALL IRON COMPRISING THE STEPS OF COLD REDUCING AN AT LEAST PARTIALLY RECRYSTALLIZED BODY OF SAID ALLOY AT LEAST 40 PERCENT TO FORM A BODY OF INTERMEDIATE THICKNESS, HEAT TREATING SAID COLD REDUCED BODY AT A TEMPERATURE OF BETWEEN 700* C. TO 1000* C. TO PRODUCE A MEASURED AVERAGE GRAIN SIZE OF FROM ABOUT 0.010 MM. TO ABOUT 0.030 MM., COLD REDUCING SAID ANNEALED BODY AT LEAST 40 PERCENT BY UNIDIRECTIONAL ROLLING TO PRODUCE A SHEET-LIKE BODY OF FINAL THICKNESS AND RAISING THE TEMPERATURE OF SAID COLD WORKED SHEET-LIKE BODY TO A TEMPERATURE OF AT LEAST 900* C. FOR A TIME SUFFICIENT TO EFFECT SECONDARY RECRYSTALLIZATION OF THE MATERIAL
Claim 2
Independent Claim
167 words
THE METHOD OF FABRICATING POLYCRYSTALLINE SHEET-LIKE BODIES OF METAL COMPRISING ELECTRICAL GRADE SILICON-IRON ALLOY CONSISTING ESSENTIALLY OF FROM ABOUT 2.5 TO 4.0 PERCENT SILICON, MORE THAN ABOUT 0.012 PERCENT SULFUR, A SUFFICIENT AMOUNT OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF MANGANESE, TITANIUM AND CHROMIUM TO COMBINE WITH THE SULFUR TO FORM SULFIDE AND THE BALANCE SUBSTANTIALLY ALL IRON COMPRISING THE STEPS OF COLD REDUCING AN AT LEAST PARTIALLY RECRYSTALLIZED BODY OF SAID ALLOY AT LEAST 40 PERCENT TO FORM A BODY OF INTERMEDIATE THICKNESS, HEAT TREATING SAID COLD REDUCED BODY AT A TEMPERATURE OF BETWEEN 700* C. TO 1000* C. TO PRODUCE A MEASURED AVERAGE GRAIN SIZE OF FROM ABOUT 0.010 MM. TO ABOUT 0.030 MM., COLD REDUCING SAID ANNEALED BODY AT LEAST 40 PERCENT BY UNIDIRECTIONAL ROLLING TO PRODUCE A SHEET-LIKE BODY OF FINAL THICKNESS AND RAISING THE TEMPERATURE OF SAID COLD WORKED SHEET-LIKE BODY TO A TEMPERATURE OF AT LEAST 900* C. FOR A TIME SUFFICIENT TO EFFECT SECONDARY RECRYSTALLIZATION OF THE MATERIAL
References Cited (Backward Citations)
US2158065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |