US3293120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper machine pressurized headbox control of stock flow
Assignee: Elsag Bailey Inc
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Filing: 1964-07-29
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Granted: 1966-12-20
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Expires: 1984-07-29
Abstract
No abstract record available.
Inventors
- 👤 Jr George L Harman
- 👤 Jack F Shannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:42
CPC Classifications
D; D21; D21F; D21F1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
IN A CONTROL SYSTEM FOR A PAPERMAKING MACHINE HAVING A TRAVELLING WEB FORMING SCREEN AND A PRESSURIZED HEADBOX CONTAINING A POOL OF STOCK AND HAVING AN ORIFICE FOR SPOUTING STOCK ON SAID SCREEN, COMPRISING IN COMBINATION, MEANS PRODUCING A FIRST SIGNAL CORRESPONDING TO THE VELOCITY OF THE SCREEN, MEANS PRODUCING A SECOND SIGNAL CORRESPONDING TO THE LEVEL OF STOCK IN THE HEADBOX, MEANS PRODUCING A THIRD SIGNAL CORRESPONDING TO THE FLOW OF STOCK TO THE HEADBOX, AND MEANS UNDER THE JOINT CONTROL OF ALL OF SAID SIGNALS REGULATING THE FLOW OF STOCK TO SAID HEADBOX.
References Cited (Backward Citations)
US2677991A
Cited
US3077924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |