US3402756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing high-nitrogen alloy steel
Assignee: Individual
•
Filing: 1965-04-27
•
Granted: 1968-09-24
•
Expires: 1985-04-27
Abstract
No abstract record available.
Inventors
- 👤 Frehser Josef
- 👤 Kubisch Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/006; C; C21; C21C; C21C7/00; C21C7/0081; C22; C22C; C22C38/00; C22C38/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US419032A
Cited
FR957046A
Cited
US1888132A
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US2021979A
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US2696433A
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US2745740A
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US2826494A
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US2975047A
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FR1188658A
Cited
US3116998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |