US2728950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fibers from films of polymeric materials
Assignee: Dow Chemical Co
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Filing: 1954-05-06
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Granted: 1956-01-03
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Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 Richard J Annesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:36
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD WHICH COMPRISES SUPPLYING A COHERENT AND UNORIENTED PLASTIC FILM TO THE NIP BETWEEN A COLD ROLL HAVING A YIELDABLE SURFACE AND A HEATED ROLL HAVING CLOSELY SPACED PARALLEL NARROW CIRCULAR RIDGES ON ITS PERIPHERY, WHILE APPLYING SUFFICIENT PRESSURE TO THE LATTER ROLL TO SCORE THE FILM TO AT LEAST HALF ITS THICKNESS, STRETCHING THE SOSCORED FILM TO EFFECT LONGITUDINAL ORIENTATION, AND MECHANICALLY SEPARATING THE STRETCHED PRODUCT INTO FIBERS ALONG THE SCORED LINES.
Claim 2
Independent Claim
74 words
THE METHOD WHICH COMPRISES SUPPLYING A COHERENT AND UNORIENTED PLASTIC FILM TO THE NIP BETWEEN A COLD ROLL HAVING A YIELDABLE SURFACE AND A HEATED ROLL HAVING CLOSELY SPACED PARALLEL NARROW CIRCULAR RIDGES ON ITS PERIPHERY, WHILE APPLYING SUFFICIENT PRESSURE TO THE LATTER ROLL TO SCORE THE FILM TO AT LEAST HALF ITS THICKNESS, STRETCHING THE SOSCORED FILM TO EFFECT LONGITUDINAL ORIENTATION, AND MECHANICALLY SEPARATING THE STRETCHED PRODUCT INTO FIBERS ALONG THE SCORED LINES.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |