Suction box for paper making machines
Abstract
Abstract A SUCTION BOX FOR PAPER MAKING MACHINES OF THE FOURDRINIER TYPE. THE SUCTION BOX COMPRISES A PAIR OF SUPPORT ROLLS OR CYLINDERS OVER WHICH THE PAPER CARRYING SCREEN TRAVELS AND A PERFORATED ROLL OR CYLINDER ON WHICH THE PAIR OF SUPPORT ROLLS ROTATE. A SELAED CHAMBER IS PROVIDED ABOUT THE PERFORATED CYLINDER, WITH SEALS ENGAGING A PORTION OF THE PAIR OF SUPPORT ROLLS. SUCTION IS PROVIDED TO THE SEALED CHAMBER, SUBSTANTIALLY AT THE CENTER OF THE LENGTH OF THE PERFORATED CYLINDER. THIS DRAWS THE WATER FROM THE WEB, THROUGH THE PERFORATED CYLINDER AND INTO THE SUCTION DRAIN OUTLET. SEALS ARE PROVIDED AT THE ENDS OF THE CYLINDERS TO COMPLETE THE SUCTION BOX. SEALING MEANS ARE ALSO PROVIDED ALONG THE EDGE OF THE WEB, BETWEEN THE PAIR OF SUPPORT CYLINDERS TO IMPROVE THE SUCTION AND PREVENT DAMAGE TO THE TRAVELING SCREEN.
Inventors
- 👤 Harry Little
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |