US1905866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing yttrium and metals of the yttrium group
Assignee: SIRIAN LAMP Co
•
Filing: 1930-02-08
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Granted: 1933-04-25
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Expires: 1950-02-08
Abstract
No abstract record available.
Inventors
- 👤 Heany John Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:06
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/34; Y; Y10; Y10S; Y10S72/00; Y10S72/70
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) | 1936-04-24 | 1936-10-24 | 1937-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-24 | 1940-10-24 | 1941-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-24 | 1944-10-24 | 1945-04-25 | $7700.00 | Window Closed / Lapsed |