US3137746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing non-woven fabrics from thermoplastic film
Assignee: Smith and Nephew Research Ltd
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Filing: 1961-07-18
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Granted: 1964-06-16
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Expires: 1981-07-18
Abstract
No abstract record available.
Inventors
- 👤 Seymour Donald Edwin
- 👤 Ketteridge David James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:04
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/143; B29D; B29D28/00; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H13/00; D04H13/02; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10S264/70; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
A METHOD FOR THE PRODUCTION OF OPENWORK NET FABRICS WHICH RESEMBLE WOVEN FABRICS, FROM A FILM OF THERMOPLASTIC MAT ERIAL HAVING A LONG CHAIN MOLECULAR STRUCTURE WITH ONE SURFACE AT LEAST FORMED AS AN EMBOSSED SURFACE OF SMALL SOLID BOSSES OR RAISED FIGURES ARRANGED WITH SPACES BETWEEN ADJACENT BOSSES IN LONGITUDINAL AND TRANSVERSE ROWS, THE ROW OF BOSSES IN EACH LONGITUDINAL ROW BEING IN STAGGERED ARRANGEMENT WITH THE ROW OF BOSSES ON EACH ADJACENT ROW, COMPRISING STRETCHING THE EMBOSSED FILM AT A DESIRED RATE IN ITS LONGITUDINAL DIRECTION UNTIL IT TAKES A PERMANENT SET, TO REMAIN IN THE STRETCHED CONDITION, AND THEN SUBJECTING THE PERMANENTLY STRETCHED FILM TO A TRANSVERSE STRETCHING, WHICH HAS THE EFFECT OF SPLITTING THE FILM WITH A MULTIPLICITY OF SHORT SPLITS THROUGH THE MATERIAL THEREOF, WHICH SPLITS EXTEND IN THE LONGITUDINAL DIRECTION BETWEEN LONGITUDINALLY ALIGNED BOSSES OF EACH LONGITUDINAL ROW, SO THAT THE SPLITS OF ONE LONGITUDINAL ROW PASS THROUGH THE SPACES BETWEEN THE TRANSVERSELY ADJACENT BOSSES OF THE TWO ADJACENT LONGITUDINAL ROWS, TO LEAVE ACH BOSS OF A LONGITUDINAL ROW WITH FOUR THINNED NARROW BANDS OF THE PARTLY ELONGATED MATERIAL INTEGRAL THEEREWITH AND EXTENDING THEREFROM. EACH OF THESE FOUR BANDS BEING INTEGRAL WITH AND EXTENDING FROM AN ADJACENT BOSS IN THE TWO ADJACENT LONGITUDINAL ROWS OF BOSSES.
Claim 2
Independent Claim
212 words
A METHOD FOR THE PRODUCTION OF OPENWORK NET FABRICS WHICH RESEMBLE WOVEN FABRICS, FROM A FILM OF THERMOPLASTIC MAT ERIAL HAVING A LONG CHAIN MOLECULAR STRUCTURE WITH ONE SURFACE AT LEAST FORMED AS AN EMBOSSED SURFACE OF SMALL SOLID BOSSES OR RAISED FIGURES ARRANGED WITH SPACES BETWEEN ADJACENT BOSSES IN LONGITUDINAL AND TRANSVERSE ROWS, THE ROW OF BOSSES IN EACH LONGITUDINAL ROW BEING IN STAGGERED ARRANGEMENT WITH THE ROW OF BOSSES ON EACH ADJACENT ROW, COMPRISING STRETCHING THE EMBOSSED FILM AT A DESIRED RATE IN ITS LONGITUDINAL DIRECTION UNTIL IT TAKES A PERMANENT SET, TO REMAIN IN THE STRETCHED CONDITION, AND THEN SUBJECTING THE PERMANENTLY STRETCHED FILM TO A TRANSVERSE STRETCHING, WHICH HAS THE EFFECT OF SPLITTING THE FILM WITH A MULTIPLICITY OF SHORT SPLITS THROUGH THE MATERIAL THEREOF, WHICH SPLITS EXTEND IN THE LONGITUDINAL DIRECTION BETWEEN LONGITUDINALLY ALIGNED BOSSES OF EACH LONGITUDINAL ROW, SO THAT THE SPLITS OF ONE LONGITUDINAL ROW PASS THROUGH THE SPACES BETWEEN THE TRANSVERSELY ADJACENT BOSSES OF THE TWO ADJACENT LONGITUDINAL ROWS, TO LEAVE ACH BOSS OF A LONGITUDINAL ROW WITH FOUR THINNED NARROW BANDS OF THE PARTLY ELONGATED MATERIAL INTEGRAL THEEREWITH AND EXTENDING THEREFROM. EACH OF THESE FOUR BANDS BEING INTEGRAL WITH AND EXTENDING FROM AN ADJACENT BOSS IN THE TWO ADJACENT LONGITUDINAL ROWS OF BOSSES.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |