Patent US2005308A successfully refreshed from Google Patents.
Patent US1973441A successfully refreshed from Google Patents.
US1973441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard alloys
Assignee: Krupp Stahl AG
•
Filing: 1931-04-24
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Granted: 1934-09-11
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Expires: 1951-04-24
Abstract
No abstract record available.
Inventors
- 👤 Moers Kurt
- 👤 Schroeter Karl
- 👤 Wolff Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:10
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/062
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) | 1937-09-10 | 1938-03-12 | 1938-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-09-10 | 1942-03-12 | 1942-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-09-10 | 1946-03-12 | 1946-09-11 | $7700.00 | Window Closed / Lapsed |