Patent US1857863A successfully refreshed from Google Patents.
US1857863A
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Mixing apparatus
Assignee: CHARLES E PARKHURST
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Filing: 1931-01-03
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Granted: 1932-05-10
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Expires: 1951-01-03
Abstract
No abstract record available.
Inventors
- 👤 William A Pervier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:48
CPC Classifications
B; B01; B01F; B01F29/00; B01F29/80; B01F29/81; A; A61; A61C; A61C5/00; A61C5/60; A61C5/68
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) | 1935-05-10 | 1935-11-09 | 1936-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-05-10 | 1939-11-09 | 1940-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-05-10 | 1943-11-09 | 1944-05-10 | $7700.00 | Window Closed / Lapsed |