US3578560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headbox for twin wire paper making apparatus
Assignee: Black Clawson Co
•
Filing: 1968-02-06
•
Granted: 1971-05-11
•
Expires: 1988-02-06
Abstract
Abstract A HEADBOX FOR USE IN A TWIN WIRE VERTICAL PAPER MAKING MACHINE COMPRISING A DOWNWARDLY EXTENDING SLICE HAVING ELONGATED PARALLEL SIDE WALLS WHICH FORM THE STOCK INTO A HIGH SPEED JET DIRECTED INTO THE AREA BETWEEN TWIN BREAST ROLLS. ONE OF THE LIPS OF THE SLICE IS ADJUSTABLE IN SUCH A MANNER THAT IS ALWAYS REMAINS PARALLEL TO THE OPPOSITE LIP SO THAT THE THICKNESS OF THE JET CAN BE VARIED WITHOUT THE CREATION OF TURBULENCE OR PRESSURE VARIATION WITHIN THE JET AS IT IS FORMED BETWEEN THE LIPS. IN ANOTHER EMBODIMENT, ONE SLICE LIP IS SIMULTANEOUSLY ADJUSTED WITH ONE BREAST ROLL TO CHANGE THE WIDTH OF THE FORMING ZONE AND THE SLICE AT THE SAME TIME.
Inventors
- 👤 Willard C Notbohm
- 👤 J Leslie Hanson
- 👤 Charles A Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:34
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |