US4014738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sifting drum paper machine wherein the diluent water is controlled
Assignee: JM Voith GmbH
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Filing: 1974-09-18
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Granted: 1977-03-29
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Expires: 1994-09-18
Abstract
Abstract Sifting drum paper machine having a sifting drum with a pulp material inlet located at the outside thereof and suction chambers disposed in the interior thereof, includes a measurement of pressure in the vicinity of a paper web-forming part on the surface of the drum, the pressure measurements being used to control the quantity of diluent water to the supply of pulp material to the pulp material inlet in response to an adjustment value fed thereto and corresponding to the measured pressure.
Inventors
- 👤 Klaus Prechtel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:40
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A sifting drum paper machine having a sifting drum with a pulp material inlet located at the outside thereof and suction chambers disposed in the interior thereof and with means for measuring pressure in vicinity of a paper web-forming part on the surface of the drum, said pressure measuring means operatively connected with means controlling the quantity of diluent water to the supply of pulp material to said pulp material inlet in accordance with said measured pressure.
Claim 2
Dependent Claim
77 words
A sifting drum paper machine having a sifting drum with a pulp material inlet located at the outside thereof and suction chambers disposed in the interior thereof and with means for measuring pressure in vicinity of a paper web-forming part on the surface of the drum, said pressure measuring means operatively connected with means controlling the quantity of diluent water to the supply of pulp material to said pulp material inlet in accordance with said measured pressure.
Claim 3
Dependent Claim
53 words
A sifting drum paper machine according to claim 1 wherein the pulp material inlet is formed with a rear wall and said pressure-measuring means are located on said rear wall in vicinity of the end region of said rear wall downstream of the flow of pulp material supplied to said pulp material inlet.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |