Patent US2528216A successfully refreshed from Google Patents.
US2528216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective grain growth of silicon steel
Assignee: General Electric Co
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Filing: 1948-02-17
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Granted: 1950-10-31
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Expires: 1968-02-17
Abstract
No abstract record available.
Inventors
- 👤 Cecil G Dunn
- 👤 Jr Birger L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:06
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/78
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
THE PROCESS OF PRODUCING LARGE GRAIN GROWTH IN ANY DESIRED AREA OF A COLD ROLLED SILICON STEEL SHEET WHICH COMPRISES INHIBITING ALL OTHER AREAS AGAINST NORMAL GRAIN GROWTH BY THE INTRODUCTION OF AN ELEMENT SELECTED FROM THE CLASS CONSISTING OF CARBON AND NITROGEN FOLLOWED BY A HEAT TREATMENT TO PRODUCE LARGE GRAINS IN THE UNINHIBITED AREAS.
References Cited (Backward Citations)
US1966130A
Cited
US2067076A
Cited
US2242234A
Cited
US2237061A
Cited
US2327256A
Cited
US2336617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |