US3420657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen treatment of chromium alloys
Assignee: Elkem Metals Co LP
•
Filing: 1966-02-14
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Granted: 1969-01-07
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Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Donald J Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/06; C21; C21C; C21C7/00; C21C7/04; C21C7/068; C21C7/0685; C22B; C22B9/00; C22B9/04; C22C33/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2093666A
Cited
FR1343235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |