Patent US2123063A successfully refreshed from Google Patents.
US1984411A
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US
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Method of case hardening
Assignee: EIDP Inc
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Filing: 1933-06-08
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Granted: 1934-12-18
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Expires: 1953-06-08
Abstract
No abstract record available.
Inventors
- 👤 Holt Donald Aubrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:32
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/28; C23C8/30; C23C8/32
Claims Analysis
Total Claims: 0
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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) | 1937-12-17 | 1938-06-18 | 1938-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-17 | 1942-06-18 | 1942-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-17 | 1946-06-18 | 1946-12-18 | $7700.00 | Window Closed / Lapsed |