US2438221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a hard facing alloy
Assignee: CALLITE TUNGSTEN Corp
•
Filing: 1942-08-13
•
Granted: 1948-03-23
•
Expires: 1962-08-13
Abstract
No abstract record available.
Inventors
- 👤 Kurtz Jacob
- 👤 Zampieri Enrico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:44
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1698935A
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US1698934A
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US1602995A
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GB373711A
Cited
US1946130A
Cited
US2050266A
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US2030343A
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US2048707A
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US2088825A
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US2253476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |