US2543027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making crinkled fibers
Assignee: Dow Chemical Co
•
Filing: 1948-09-18
•
Granted: 1951-02-27
•
Expires: 1968-09-18
Abstract
No abstract record available.
Inventors
- 👤 Le Roy V Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD WHICH COMPRISES HEATING AN EXTRUDABLE NORMALLY CRYSTALLINE SARAN IN EXTRUSION APPARATUS TO A TEMPERATURE FROM 5 TO 20 CENTIGRADE DEGREES ABOVE ITS MELTING POINT, THEN, WHILE ADVANCING THE SARAN TOWARD AN EXTRUSION ORIFICE, COOLING THE SARAN FROM 15 TO 25 DEGREES TO A TEMPERATURE 5 TO 20 DEGREES BELOW ITS MELTING POINT EXTRUDING THE SARAN IN THE FORM OF FILAMENTS AT THE SAID LOWER TEMPERATURE, AND SUPERCOOLING AND STRETCHING THE FILAMENTS, TO OBTAIN A FILAMENTARY PRODUCT HAVING A NATURAL CRINKLE.
Claim 2
Independent Claim
82 words
THE METHOD WHICH COMPRISES HEATING AN EXTRUDABLE NORMALLY CRYSTALLINE SARAN IN EXTRUSION APPARATUS TO A TEMPERATURE FROM 5 TO 20 CENTIGRADE DEGREES ABOVE ITS MELTING POINT, THEN, WHILE ADVANCING THE SARAN TOWARD AN EXTRUSION ORIFICE, COOLING THE SARAN FROM 15 TO 25 DEGREES TO A TEMPERATURE 5 TO 20 DEGREES BELOW ITS MELTING POINT EXTRUDING THE SARAN IN THE FORM OF FILAMENTS AT THE SAID LOWER TEMPERATURE, AND SUPERCOOLING AND STRETCHING THE FILAMENTS, TO OBTAIN A FILAMENTARY PRODUCT HAVING A NATURAL CRINKLE.
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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |