US3563852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headbox for twin wire paper making apparatus
Assignee: Black Clawson Co
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Filing: 1967-08-11
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Granted: 1971-02-16
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Expires: 1987-08-11
Abstract
Abstract A HEADBOX FOR USE WITH A TWIN WIRE VERTICAL PAPER MAKING MACHINE COMPRISES A MAIN BODY HAVING THEREIN TWO ROWS OF DOWNWARDLY EXTENDING STOCK INLET PASSAGEWAYS WHICH CONVERGE IN AN ALTERNATING MANNER INTO A HIGH PRESSURE BLENDING CHAMBER EXTENDING PARALLEL TO THE NIP, AND SPACED LIP MEMBERS DEFINING A DISCHARGE SLOT LEADING FROM THE BLENDING CHAMBER FOR DIRECTING A CONTROLLED STREAM OF PAPER MAKIN STOCK DOWNWARDLY INTO THE FORMING ZONE AT A VELOCITY SUBSTANTIALLY EQUAL TO THE SPEED OF THE WIRES.
Inventors
- 👤 Walter E Rojecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |