US3337394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foil type drainage apparatus for paper making machines
Assignee: Jwi Ltd
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Filing: 1964-12-17
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Granted: 1967-08-22
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Expires: 1984-12-17
Abstract
No abstract record available.
Inventors
- 👤 White William Sherman
- 👤 Buchanan John Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:40
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/483
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A DRAINAGE FOIL FOR USE IN A PAPER MAKING MACHINE HAVING A FORMING WIRE AND A T-SHAPED SUPPORTING RAIL BY BEING SLIDABLY MOUNTED UPON THE UPPER PORTION OF SAID TSHAPED RAIL, SAID FOIL HAVING: AN UPPERSURFACE INCLUDING A SUBSTANTIALLY FLAT WIRE HEARING PORTION AND A SUCTION CREATING DIVERGING PORTION, SAID SUCTION PORTION BEING DISPOSED AT AN ANGLE TO SAID FORMING WIRE WHEN OPERATIVELY INSTALLED IN SAID PAPER MAKING MACHINE; AND SAID FOIL DEFINING A T-SHAPED LONGITUDINALLY EXTENDING RECESS TERMINATING IN THE LOWER SURFACE OF SAID FOIL, THE WIDTH OF SAID T-SHAPED RECESS BEING GREATER THAN THE CORRESPONDING WIDTH OF SAID T-SHAPED RAIL TO BE RECEIVED IN SAID TSHAPED RECESS TO PROVIDE A CLEARANCE BETWEEN THE SIDE EDGES OF THE UPPER PORTION OF THE T-SHAPED RAIL AND THE OPPOSED SIDE WALLS OF SAID T-SHAPED RECESS, AND SAID TSHAPED RECESS FURTHER INCLUDING AN UPPER WALL SURFACE SUBSTANTIALLY PARALLEL TO SAID FORMING WIRE WHEN SAID FOIL IS OPERATIVELY INSTALLED IN SAID PAPER MAKING MACHINE AND INWARDLY PROJECTING FLANGE MEANS AT THE LEADING AND TRAILING EDGES THEREOF EXTENDING FROM AID OPPOSED SIDE WALLS
Claim 2
Dependent Claim
179 words
A DRAINAGE FOIL FOR USE IN A PAPER MAKING MACHINE HAVING A FORMING WIRE AND A T-SHAPED SUPPORTING RAIL BY BEING SLIDABLY MOUNTED UPON THE UPPER PORTION OF SAID TSHAPED RAIL, SAID FOIL HAVING: AN UPPERSURFACE INCLUDING A SUBSTANTIALLY FLAT WIRE HEARING PORTION AND A SUCTION CREATING DIVERGING PORTION, SAID SUCTION PORTION BEING DISPOSED AT AN ANGLE TO SAID FORMING WIRE WHEN OPERATIVELY INSTALLED IN SAID PAPER MAKING MACHINE; AND SAID FOIL DEFINING A T-SHAPED LONGITUDINALLY EXTENDING RECESS TERMINATING IN THE LOWER SURFACE OF SAID FOIL, THE WIDTH OF SAID T-SHAPED RECESS BEING GREATER THAN THE CORRESPONDING WIDTH OF SAID T-SHAPED RAIL TO BE RECEIVED IN SAID TSHAPED RECESS TO PROVIDE A CLEARANCE BETWEEN THE SIDE EDGES OF THE UPPER PORTION OF THE T-SHAPED RAIL AND THE OPPOSED SIDE WALLS OF SAID T-SHAPED RECESS, AND SAID TSHAPED RECESS FURTHER INCLUDING AN UPPER WALL SURFACE SUBSTANTIALLY PARALLEL TO SAID FORMING WIRE WHEN SAID FOIL IS OPERATIVELY INSTALLED IN SAID PAPER MAKING MACHINE AND INWARDLY PROJECTING FLANGE MEANS AT THE LEADING AND TRAILING EDGES THEREOF EXTENDING FROM AID OPPOSED SIDE WALLS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |