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US1338271A
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Process for recovery of metals from their ores
Assignee: International Precipitation Co
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Filing: 1917-08-11
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Granted: 1920-04-27
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Expires: 1937-08-11
Abstract
No abstract record available.
Inventors
- 👤 Harry V Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:21
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/16; C22; C22B; C22B19/00; C22B19/04; C22B19/16; C22B19/18; Y; Y10; Y10S; Y10S55/00; Y10S55/38
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) | 1923-04-27 | 1923-10-27 | 1924-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-04-27 | 1927-10-27 | 1928-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-04-27 | 1931-10-27 | 1932-04-27 | $7700.00 | Window Closed / Lapsed |