US1820210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reagent feeding
Assignee: UNITED VERDE COPPER Co
•
Filing: 1929-03-18
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Granted: 1931-08-25
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Expires: 1949-03-18
Abstract
No abstract record available.
Inventors
- 👤 Lyle M Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:35
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1443; B03D1/145; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0352; Y10T137/2496; Y10T137/2499; Y10T137/4891; Y10T137/8593; Y10T137/85954; Y10T137/86187; Y10T137/86196; Y10T137/87917
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) | 1934-08-24 | 1935-02-23 | 1935-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-24 | 1939-02-23 | 1939-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-24 | 1943-02-23 | 1943-08-25 | $7700.00 | Window Closed / Lapsed |