Multiple-stage evaporator
Abstract
Abstract A TWENTY-STAGE VACUUM EVAPORATOR IS MADE FROM A SERIES OF 20 SLOPING SHEETS OF POLYESTER PLASTIC FILM SEPARATED BY 0.5 INCH DIAMETER PEBBLES. THE PLASTIC SHEETS OF FILM SLOPE AT A 15* ANGLE AND ARE SUPPORTED 8 INCHES APART BY AND IN A BED OF THE PEBBLES. PUMPS CIRCULATE THE LIQUID SOLUTION EVAPORATED OVER THE UPPER SURFACES OF THE PLASTIC SHEETS OF FILM AND THE LIQUID IS EVAPORATED BY VAPORS CONTACTING AND CONDENSING ON THE UNDER SURFACES OF THE PLASTIC SHEETS, WITH EACH SHEET DIVIDING OFF A CHAMBER THAT EVAPORATES LIQUID AT A SUC ESSIVE LOWER PRESSURE. CONDENSATE FORMED BY THE VAPORS CONDENSING ON THE UNDERSIDE OF THE PLASTIC SHEETS IS PREVENTED FROM MIXING WITH THE LIQUID SOLUTION BEING EVAPORATED BY A SERIES OF SHORT PLASTIC SHEETS, PLACED AT A SMALLER ANGLE WITH THE HORIZONTAL THAN THE LARGER SHEETS, THAT CATCH THE CONDENSATE LIKE SHINGLES ON A HOUSE AND DIRECT THE CONDENSATE INTO BOTTOM OUTLETS.
Inventors
- 👤 John C St Clair
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |