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US925988A
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Process of hardening tantalum.
Assignee: Siemens and Halske AG
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Filing: 1908-03-20
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Granted: 1909-06-22
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Expires: 1928-03-20
Abstract
No abstract record available.
Inventors
- 👤 Werner Von Bolton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:03
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/02; Y; Y10; Y10S; Y10S76/00; Y10S76/11
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) | 1912-06-21 | 1912-12-21 | 1913-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-06-21 | 1916-12-21 | 1917-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-06-21 | 1920-12-21 | 1921-06-22 | $7700.00 | Window Closed / Lapsed |