Patent US2215645A successfully refreshed from Google Patents.
US2215645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for treating tungsten, and the product thereof
Assignee: Westinghouse Electric Corp
•
Filing: 1938-02-01
•
Granted: 1940-09-24
•
Expires: 1958-02-01
Abstract
No abstract record available.
Inventors
- 👤 Charles V Iredell
- 👤 Thomas J Hankins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1943-09-24 | 1944-03-25 | 1944-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-24 | 1948-03-25 | 1948-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-24 | 1952-03-25 | 1952-09-24 | $7700.00 | Window Closed / Lapsed |