US3586601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basis weight control system for a paper making machine
Assignee: Beloit Corp
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Filing: 1968-12-23
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Granted: 1971-06-22
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Expires: 1988-12-23
Abstract
Abstract IN ORDER TO PRODUCE A MORE ACCURATE FINAL BASIS WEIGHT AT THE REEL OR DRY END OF A PAPER MAKING MACHINE, THE BASIS WEIGHT VALVE IS ADJUSTED VIA A FEEDFORWARD CONTROL LOOP THAT PROVIDES A COMPUTED SIGNAL DERIVED FROM MEASURED HEAVY STOCK CONSISTENCY, FLOW AND FOURDRINIER WIRE SPEED. COMPENSATION, HOWEVER, IS MADE TO THE FEEDFORWARD LOOP BY A FEEDBACK CONTROL LOOP WHICH FURNISHES A SIGNAL COMPUTED FROM THE ACTUAL BASIS WEIGHT AT THE REEL. WHEN A GRADE CHANGE IS TO BE MADE, THE NEW SET POINT SIGNAL REPRESENTING THE DIFFERENT GRADE IS CAUSED TO TEMPORARILY BYPASS THE FEEDBACK CONTROL SO AS TO ALLOW THE FEEDFORWARD LOOP TO PROVIDE A RAPID ADJUSTMENT OF THE BASIS WEIGHT VALVE.
Inventors
- 👤 Spencer R Persik Jr
- 👤 Marion A Keyes
- 👤 Douglas L Bockstanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:09
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/06; Y; Y10; Y10S; Y10S162/00; Y10S162/06; Y10S162/09; Y10S162/10; Y10S162/11
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |