Structure for and method of drying granular material
Abstract
Abstract THE STRUCTURE FOR DRYING GRANULAR MATERIAL DISCLOSED COMPRISES AN OVEN INCLUDING MEANS FOR SUPPORTING A SAMPLE OF GRANULAR MATERIAL ON A FILTER PAPER OR IN A SPECIALLY CONSTRUCTED PAN OVER AN OPENING THROUGH WHICH A VACUUM IS DRAWN IN THE OVEN, MEANS FOR SEALING THE SAMPLE OF GRANULAR MATERIAL OVER THE VACUUM FORMING OPENING AND FOR SEALING THE OVEN EXCEPT FOR A C ONTROLLED AIR INTAKE OPENING IN RESPONSE TO DRAWING A VACUUM IN THE OVEN, AND MEANS FOR MAINTAINING THE OVEN AT A PREDETERMINED TEMPERATURE. THE VACUUM IS DRAWN IN THE OVEN HROUGH A CONDUIT CONNECTED TO A MOTOR DRIVEN VACUUM PUMP OF LARGE CAPACITY. TEMPERATURE IS MAINTAINED AT A PREDETERMINED LEVEL IN THE OVEN BY MEANS OF THERMOSTATICALLY CONTROLLED TEMPERATURE REGULATING AND INDICATING HEATING STRUCTURE.
Inventors
- 👤 Harry W Dietert
Bibliographic Details
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |