Patent US1940246A successfully refreshed from Google Patents.
US1940246A
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US
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Ore treating machine
Assignee: AO Smith Corp
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Filing: 1931-10-05
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Granted: 1933-12-19
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Expires: 1951-10-05
Abstract
No abstract record available.
Inventors
- 👤 Louis F Clark
- 👤 Carl L Wallfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:44
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C21; C21B; C21B13/00; C21B13/02; C22B1/14; C21B2100/00; C21B2100/60; C21B2100/66; Y; Y02; Y02P; Y02P10/00; Y02P10/25
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) | 1936-12-18 | 1937-06-19 | 1937-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-18 | 1941-06-19 | 1941-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-18 | 1945-06-19 | 1945-12-19 | $7700.00 | Window Closed / Lapsed |