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US2489839A
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Process for carburizing compacted iron articles
Assignee: Isthmian Metals Inc
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Filing: 1946-04-30
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Granted: 1949-11-29
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Expires: 1966-04-30
Abstract
No abstract record available.
Inventors
- 👤 Lyman F Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:32
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; B; B22; B22F; B22F3/00; B22F3/24; C23; C23C; C23C8/00; B22F2003/241
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |