US3220920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable drainage foil for fourdrinier paper machines
Assignee: Library and Archives Canada
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Filing: 1963-11-13
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Granted: 1965-11-30
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Expires: 1983-11-13
Abstract
No abstract record available.
Inventors
- 👤 Truxa Leslie
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; D21F1/486
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A DRAINAGE FOIL FOR A FOURDRINIER TYPE PAPER MACHINE HAVING A FORMING WIRE, SAID FOIL EXTENDING ACROSS THE FOURDRINIER MACHINE AND UNDER SAID WIRE TRANSVERSELY OF THE DIRECTION OF WIRE TRAVEL, SAID FOIL COMPRISING A LEADING PORTION AND TRAILING PORTION, SAID LEADING PORTION BEING IN SUPPORTING RELATIONSHIP TO THE WIRE, CLOSELY SPACED SUPPORTS BEING FORMED INTEGRAL WITH SAD FOIL LEADING PORTION AND PROVIDING SUPPORT THEREFOR, PASSAGES EXTENDING BETWEEN SAID SPACED SUPPORTS FOR THE ESCAPE OF FLUID, SAID PASSAGES OPENING TOWARDS THE LEADING EDGE OF SAID FOIL.
Claim 2
Dependent Claim
86 words
A DRAINAGE FOIL FOR A FOURDRINIER TYPE PAPER MACHINE HAVING A FORMING WIRE, SAID FOIL EXTENDING ACROSS THE FOURDRINIER MACHINE AND UNDER SAID WIRE TRANSVERSELY OF THE DIRECTION OF WIRE TRAVEL, SAID FOIL COMPRISING A LEADING PORTION AND TRAILING PORTION, SAID LEADING PORTION BEING IN SUPPORTING RELATIONSHIP TO THE WIRE, CLOSELY SPACED SUPPORTS BEING FORMED INTEGRAL WITH SAD FOIL LEADING PORTION AND PROVIDING SUPPORT THEREFOR, PASSAGES EXTENDING BETWEEN SAID SPACED SUPPORTS FOR THE ESCAPE OF FLUID, SAID PASSAGES OPENING TOWARDS THE LEADING EDGE OF SAID FOIL.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |