Patent US2161619A successfully refreshed from Google Patents.
Patent US3649448A successfully refreshed from Google Patents.
US3649448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper machine headbox with adjustable partitions therein to regulate stock flow
Assignee: Individual
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Filing: 1969-12-30
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Granted: 1972-03-14
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Expires: 1989-12-30
Abstract
Abstract A headbox with first and second partitions therein which are adjustable with respect to one another and the headbox to define a feed chamber, a holding chamber, and an outflow chamber, and which the function to regulate the rate at which stock flows from the slice. The partitions are moved by rack and pinions located externally of the headbox, the first partition pivoting around its upper end and the second partition pivoting at a point intermediate its ends. Perforated rolls are located in the feed chamber and outflow chamber to facilitate the entwining of stock fibers.
Inventors
- 👤 Tadashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:25
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/06
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |