Patent US5562689A successfully refreshed from Google Patents.
Patent US1701942A successfully refreshed from Google Patents.
US1701942A
Expired / Lapsed
US
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Vortex classifier suitable for use in the classification of powdered materials by elutriation
Assignee: Individual
•
Filing: 1927-07-23
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Granted: 1929-02-12
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Expires: 1947-07-23
Abstract
No abstract record available.
Inventors
- 👤 Andrews Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:38
CPC Classifications
B; B04; B04C; B04C9/00; B04C3/00
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) | 1932-02-12 | 1932-08-13 | 1933-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-02-12 | 1936-08-13 | 1937-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-02-12 | 1940-08-13 | 1941-02-12 | $7700.00 | Window Closed / Lapsed |