US2938629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of comminuted materials
Assignee: SMITH DOUGLASS CO Inc
•
Filing: 1955-07-28
•
Granted: 1960-05-31
•
Expires: 1975-07-28
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 Charles J Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:24
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/24; B03D1/1406; B03D1/1431; Y; Y10; Y10S; Y10S261/00; Y10S261/75
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1328456A
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US864856A
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US1159044A
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US1167835A
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US1299059A
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US1720264A
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US2241337A
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US2272818A
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US2624657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |