US3606037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Central drag line system for non-cylindrical particle storage facilities
Assignee: Atlas Spokane Inc
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Filing: 1969-07-22
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Granted: 1971-09-20
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Expires: 1989-07-22
Abstract
Abstract A PLURALITY OF DRAG LINES ARE ATTACHED TO CONTINUOUS CHAIN MOUNTED ABOVE A FLAT FLOOR OVER A FLOOR APERATURE IN THE CENTER OF A NON-CYLINDRICAL PARTICLE STORAGE FACILITY FOR DIGGING GRANULAR MATERIAL FROM A BASE OF A PILE AND CONVEYING THE MATERIAL TO THE FLOOR APERATURE.
Inventors
- 👤 John L Peterson
- 👤 George H Pettis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:31
CPC Classifications
B; B65; B65G; B65G65/00; B65G65/30; B65G65/34; B65G65/40; B65G65/42
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |