Patent US2583227A successfully refreshed from Google Patents.
US2583227A
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US
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Induction heat treating
Assignee: Elgin National Watch Co
•
Filing: 1947-01-24
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Granted: 1952-01-22
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Expires: 1967-01-24
Abstract
No abstract record available.
Inventors
- 👤 Ray S Neidigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:40
CPC Classifications
G; G04; G04B; G04B1/00; G04B1/10; G04B1/14; G04B1/145; C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/60; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49579
Claims Analysis
Total Claims: 0
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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) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |