Patent US2924503A successfully refreshed from Google Patents.
US2924503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for melt spinning polyesters containing an alkaline earth sulfate filler
Assignee: EIDP Inc
•
Filing: 1957-07-30
•
Granted: 1960-02-09
•
Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Cecil E Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:57
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THE PROCESS OF PRODUCING ORIENTED YARNS WHICH COMPRISES MELT SPINNING A COMPOSITION COMPRISING A LINEAR TEREPHATHALATE POLYESTER AND AT LEAST ABOUT 1% BY WEIGHT OF A FINELY-DIVIDED ALKALINE EARTH METAL SULFATE TO PRODUCE FILAMENTS AND THEREAFTER DRAWING THE SAID FILAMENTS OVER A SNUBBING SURFACE HEATED TO A TEMPERATURE OF BETWEEN ABOAUT 90* C. AND ABOUT 115* C. AT A RATE OF AT LEAST 650 YARDS PER MINUTE.
Claim 2
Dependent Claim
67 words
THE PROCESS OF PRODUCING ORIENTED YARNS WHICH COMPRISES MELT SPINNING A COMPOSITION COMPRISING A LINEAR TEREPHATHALATE POLYESTER AND AT LEAST ABOUT 1% BY WEIGHT OF A FINELY-DIVIDED ALKALINE EARTH METAL SULFATE TO PRODUCE FILAMENTS AND THEREAFTER DRAWING THE SAID FILAMENTS OVER A SNUBBING SURFACE HEATED TO A TEMPERATURE OF BETWEEN ABOAUT 90* C. AND ABOUT 115* C. AT A RATE OF AT LEAST 650 YARDS PER MINUTE.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |