Patent US3811979A successfully refreshed from Google Patents.
US3811979A
Expired / Lapsed
US
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Peg-roll softening of fibrillated sheet
Assignee: EIDP Inc
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Filing: 1970-12-16
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Granted: 1974-05-21
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Expires: 1990-12-16
Abstract
Abstract A NONWOVEN SHEET OF FIBRILLATED ORGANIC POLYMER MATERIAL IS SOFTENED BY PASSAGE THROUGH THE NIP FORMED BETWEEN TWO PARALLEL ROLLS EACH BEARING A MULTIPLICITY OF SQUARE-ENDED PEGS, THE LOCUS OF THE ENDS OF ALL PEGS ON EACH ROLL LYING ON A CYLINDER WHOSE AXIS COINCIDES WITH THE ROLL AXIS, THE SAID ROLLS BEING ENGAGED SUCH THAT AN ARRAY OF PEGS OF ONE ROLL INTERPENETRATES AN ARRAY OF PEGS ON THE OPPOSITE ROLL BY AN AMOUNT THAT IS AT LEAST EQUAL TO THE THICKNESS OF THE NONWOVEN SHEET.
Inventors
- 👤 J Dempsey
- 👤 D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:00
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D06; D06C; D06C15/00; D06C15/02; D06C19/00; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T156/1052; Y10T156/1084; Y10T156/1087; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264
Claims Analysis
Total Claims: 0
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |