US3575739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary recrystallization of silicon iron with nitrogen
Assignee: General Electric Co
•
Filing: 1968-11-01
•
Granted: 1971-04-20
•
Expires: 1988-11-01
Abstract
Abstract THIS INVENTION DISCLOSES THE PRODUCTION OF SILICON-IRON SHEET MATERIAL USEFUL AS A MAGNETIC MATERIAL IN ELECTRICAL APPLICATIONS AND WHICH HAS THE CUBE-ON-EDGE OR (110) (001) CRYSTALLOGRAPHIC GRAIN ORIENTATION. CONVENTIONALLY, THIS STRUCTURE IS PRODUCED BY A PHENOMENON KNOWN AS SECONDARY RECRYSTALLIZATION WHICH HAS DEPENDED UPON A DISPERSION OF PARTICLES OF SULFUR COMPOUNDS WHICH ARE DIFFICULT TO REMOVE. IT HAS BEEN FOUND THAT NITROGEN COMPOUNDS MAY BE SUBSTISTUTED FOR THE SULFUR COMPOUNDS AND THE DESIRED STRUCTURE PRODUCED. THE NITROGEN IS MUCH EASIER TO REMOVE.
Inventors
- 👤 Howard C Fiedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1255
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |