Patent US2406401A successfully refreshed from Google Patents.
US3054652A
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Isotactic polypropylene melt spinning process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-08-28
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Granted: 1962-09-18
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Expires: 1977-08-28
Abstract
No abstract record available.
Inventors
- 👤 Heumann Walter Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:25
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR MAKING IMPROVED FIBERS WHICH COMPRISES EXTRUDING A HIGH MOLECULLAR WEIGHT, ISOTACTIC, PLASTIC PROPYLENE POLYMER HAVING A CRYSTALLINITY OF 40 TO 95%, A DENSITY BETWEEN 0.89 AND 0.95 AND A MELTING POINT BETWEEN 300* AND 340*F., AT A TEMPERATURE IN THE RANGE OF ABOUT 392* TO 572*F. INTO FILAMENTS, COOLING THE EXTRUDED FILAMENTS IN AN INERT GASEOUS MEDIUM AT A TEMPERATURE BETWEEN ABOUT -40* TO 40*F. AND ORIENTING THE RESULTING FILAMENTS BY DRAWING AT A TEMPERATURE IN THE RANGE OF ABOUT 149* TO 248*F. UNTIL THEIR INITIAL LENGTH IS INCREASED BY ABOUT 600 TO 900%.
Claim 2
Dependent Claim
97 words
A PROCESS FOR MAKING IMPROVED FIBERS WHICH COMPRISES EXTRUDING A HIGH MOLECULLAR WEIGHT, ISOTACTIC, PLASTIC PROPYLENE POLYMER HAVING A CRYSTALLINITY OF 40 TO 95%, A DENSITY BETWEEN 0.89 AND 0.95 AND A MELTING POINT BETWEEN 300* AND 340*F., AT A TEMPERATURE IN THE RANGE OF ABOUT 392* TO 572*F. INTO FILAMENTS, COOLING THE EXTRUDED FILAMENTS IN AN INERT GASEOUS MEDIUM AT A TEMPERATURE BETWEEN ABOUT -40* TO 40*F. AND ORIENTING THE RESULTING FILAMENTS BY DRAWING AT A TEMPERATURE IN THE RANGE OF ABOUT 149* TO 248*F. UNTIL THEIR INITIAL LENGTH IS INCREASED BY ABOUT 600 TO 900%.
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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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |