US1835667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hardening copper containing steels for structural and similar purposes
Assignee: Vereinigte Stahlwerke AG
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Filing: 1929-04-05
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Granted: 1931-12-08
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Expires: 1949-04-05
Abstract
No abstract record available.
Inventors
- 👤 Nehl Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/18; C22; C22C; C22C38/00; C22C38/16; Y; Y10; Y10S; Y10S122/00; Y10S122/13
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) | 1934-12-07 | 1935-06-08 | 1935-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-07 | 1939-06-08 | 1939-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-07 | 1943-06-08 | 1943-12-08 | $7700.00 | Window Closed / Lapsed |