Patent US2475050A successfully refreshed from Google Patents.
US2991218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper making
Assignee: Rice Barton Corp
•
Filing: 1958-01-31
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Granted: 1961-07-04
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Expires: 1978-01-31
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Cirrito
- 👤 Nicholas M Reitzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN COMBINATION, A SUCTION ROLL, A FORMING WIRE TRAINED THEREROUND, SAID ROLL COMPRISING A CYLINDICAL SHELL HAVING A MULTIPLICITY OF HOLES THERETHROUGH FOR RECEIVING A STRONG WHITE WATER DRAINED THROUGH SAID WIRE, THE CROSS-SECTIONAL AREA OF EACH OF SAID HOLES BEING SUCH THAT LIQUID STORED THEREIN CAN BE HELD INTACT AND CONTROLLED AS TO MOVEMENT THEREIN BY PRESSURE DIFFERENTIAL APPLIED ACROSS THE OPPOSITE ENDS THEREOF, MEANS FOR DISCHARGING A STREEM OF DILUTE PAPER STOCK ONTO SAID WIRE AND ROLL, AND A SERIES OF SUCTION BOXES ENGAGING THE INNER SURFACE OF SAID SHELL AND IN COMMUNICATION WITH THE INNER ENDS OF SAID HOLES, SAID BOXES BEING ADAPTED TO BE CONNECTED TO DIFFERENT SOURCES OF CONTROLLED AIR PRESSURE WHEREBY THE PRESSURE DIFFERENTIAL BETWEEN THE PRESSURE WHEREIN EACH BOX AND THAT ABOVE THE WIRE MAY BE SELECTIVELY CONTROLLED AS TO WHETHER IT IS POSITIVE, NEGATIVE OR NEUTRAL.
Claim 2
Dependent Claim
144 words
IN COMBINATION, A SUCTION ROLL, A FORMING WIRE TRAINED THEREROUND, SAID ROLL COMPRISING A CYLINDICAL SHELL HAVING A MULTIPLICITY OF HOLES THERETHROUGH FOR RECEIVING A STRONG WHITE WATER DRAINED THROUGH SAID WIRE, THE CROSS-SECTIONAL AREA OF EACH OF SAID HOLES BEING SUCH THAT LIQUID STORED THEREIN CAN BE HELD INTACT AND CONTROLLED AS TO MOVEMENT THEREIN BY PRESSURE DIFFERENTIAL APPLIED ACROSS THE OPPOSITE ENDS THEREOF, MEANS FOR DISCHARGING A STREEM OF DILUTE PAPER STOCK ONTO SAID WIRE AND ROLL, AND A SERIES OF SUCTION BOXES ENGAGING THE INNER SURFACE OF SAID SHELL AND IN COMMUNICATION WITH THE INNER ENDS OF SAID HOLES, SAID BOXES BEING ADAPTED TO BE CONNECTED TO DIFFERENT SOURCES OF CONTROLLED AIR PRESSURE WHEREBY THE PRESSURE DIFFERENTIAL BETWEEN THE PRESSURE WHEREIN EACH BOX AND THAT ABOVE THE WIRE MAY BE SELECTIVELY CONTROLLED AS TO WHETHER IT IS POSITIVE, NEGATIVE OR NEUTRAL.
References Cited (Backward Citations)
US1581656A
Cited
US1822023A
Cited
US2077614A
Cited
US2418600A
Cited
GB629633A
Cited
US2714839A
Cited
US2714340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |