US2803756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewing chamber for gravity sorter
Assignee: Mandrel Industries Inc
•
Filing: 1952-01-04
•
Granted: 1957-08-20
•
Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 David C Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
B; B07; B07C; B07C5/00; B07C5/34; B07C5/342; B07C5/3425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2413486A
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US2436762A
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US2656923A
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US2696297A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |