US2974797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grain classifier
Assignee: DE KALB AGRICULTURAL ASSOCIATION Inc
•
Filing: 1957-08-30
•
Granted: 1961-03-14
•
Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Charles E Blackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:46
CPC Classifications
B; B07; B07B; B07B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US556786A
Cited
US1636227A
Cited
US1715197A
Cited
US1947035A
Cited
US2139380A
Cited
US2153688A
Cited
US2406842A
Cited
US2449611A
Cited
US2813599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |