Patent US3216892A successfully refreshed from Google Patents.
US3216892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headbox for paper machine
Assignee: Metso Fiber Karlstad AB
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Filing: 1963-04-09
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Granted: 1965-11-09
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Expires: 1983-04-09
Abstract
No abstract record available.
Inventors
- 👤 Wahlstrom Per Borje
- 👤 Stenberg Erik Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:06
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A HEADBOX FOR A PAPER MACHINE, COMPRISING A FIRST HOLE-PLATE HAVING A PLURALITY OF HOLES THROUGH WHICH PULP CAN FLOW IN A PLURALITY OF JETS, SAID HOLES BEING SEPARATED BY LAND AREAS, A SECOND PLATE SUBSTANTIALLY PARALLEL WITH SAID FIRST PLATE AND; DOWNSTREAM FROM AND ADJACENT THERETO, SID SECOND OLE PLATE LAND AREAS IN REGISTER WITH THE HOLES OF SID FIRST HOLE-PLATE AGAINST WHICH THE JETS FROM SAID FIRST HOLE-PLATE IMPINGE, AND SAID SECOND-PLATE HAVING OPEN AREAS OUT OF REGISTER WITH AND SUBSTANTIALLY EQUAL IN NUMBER TO AND OF GREATER TOTAL AREA THAN SAID HOLES OF SAID FIRST HOLE-PLATE SO THAT JETS OF SAID PULP FROM SAID HOLES ARE DEFLECTED LATERALLY BEFORE SAID PULP CAN PASS THROUGH SAID OPEN AREAS.
Claim 2
Dependent Claim
120 words
A HEADBOX FOR A PAPER MACHINE, COMPRISING A FIRST HOLE-PLATE HAVING A PLURALITY OF HOLES THROUGH WHICH PULP CAN FLOW IN A PLURALITY OF JETS, SAID HOLES BEING SEPARATED BY LAND AREAS, A SECOND PLATE SUBSTANTIALLY PARALLEL WITH SAID FIRST PLATE AND; DOWNSTREAM FROM AND ADJACENT THERETO, SID SECOND OLE PLATE LAND AREAS IN REGISTER WITH THE HOLES OF SID FIRST HOLE-PLATE AGAINST WHICH THE JETS FROM SAID FIRST HOLE-PLATE IMPINGE, AND SAID SECOND-PLATE HAVING OPEN AREAS OUT OF REGISTER WITH AND SUBSTANTIALLY EQUAL IN NUMBER TO AND OF GREATER TOTAL AREA THAN SAID HOLES OF SAID FIRST HOLE-PLATE SO THAT JETS OF SAID PULP FROM SAID HOLES ARE DEFLECTED LATERALLY BEFORE SAID PULP CAN PASS THROUGH SAID OPEN AREAS.
References Cited (Backward Citations)
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US2688905A
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US2881674A
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US2929449A
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US3092540A
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US3103463A
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US3119733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |