US2505491A
Expired / Lapsed
US
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Control mechanism for gravimetric feeders
Assignee: Individual
•
Filing: 1944-05-17
•
Granted: 1950-04-25
•
Expires: 1964-05-17
Abstract
No abstract record available.
Inventors
- 👤 Harper Esther Pardee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:25
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687; G; G01; G01G; G01G13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |