Patent US3559299A successfully refreshed from Google Patents.
US3559299A
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US
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Grain dryer and method of drying grain
Assignee: JP Burroughs and Son Inc
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Filing: 1969-02-28
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Granted: 1971-02-02
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Expires: 1989-02-28
Abstract
Abstract A FILTERING METHOD AND APPARATUS FOR GRAIN DRYERS FOR CONTINUOUSLY FILTERING EXHAUST AIR AFTER IT HAS BEEN USED TO DRY GRAIN. THE AIR IS FILTERED BY PASSING THROUGH A COLUMN THROUGH WHICH FILTERING MEDIA PASSES. MEANS ARE PROVIDED TO SELECTIVELY MOVE THE FILTER MEDIA RELATIVE TO THE AIR STREAM.
Inventors
- 👤 Duane W Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:01
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/12; F26B17/14; F26B17/1408; F26B17/1416
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |