US2581566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of spun yarns
Assignee: Celanese Corp
•
Filing: 1948-11-05
•
Granted: 1952-01-08
•
Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
- 👤 Whitehead William
- 👤 John B Stelding
- 👤 Leo B Brown
- 👤 William L Rooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
D; D01; D01D; D01D10/00; D01D10/04; D01D10/0436; D01D10/0481; D01D10/0445; D01D5/00; D01D5/26; D01F; D01F2/00; D01F2/24; D01F2/28; D02; D02G; D02G3/00; D02G3/02; D10; D10B; D10B2201/00; D10B2201/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN A PROCESS FOR PRODUCING SPUN YARNS AND THE LIKE OF HIGH-TENACITY REGENERATED CELLULOSE STAPLE FIBERS FROM A TOW OF STRETCHED CONTINUOUS FILAMENTS HAVING A BASIS OF AN ORGANIC ACID ESTER OF CELLULOSE, THE STEPS WHICH COMPRISE BREAKERDRAFTING SAID TOW WHILE THE FILAMENTS ARE IN AN UNPLASTICIZER STATE TO CONVERT THE CONTINUOUS FILAMENTS INTO FIBERS OF STAPLE LENGTH, AND SAPONIFYING THE FIBERS TO CONVERT THE ORGANIC ACID ESTER OF CELLULOSE TO REGENERATED CELLULOSE.
Claim 2
Dependent Claim
73 words
IN A PROCESS FOR PRODUCING SPUN YARNS AND THE LIKE OF HIGH-TENACITY REGENERATED CELLULOSE STAPLE FIBERS FROM A TOW OF STRETCHED CONTINUOUS FILAMENTS HAVING A BASIS OF AN ORGANIC ACID ESTER OF CELLULOSE, THE STEPS WHICH COMPRISE BREAKERDRAFTING SAID TOW WHILE THE FILAMENTS ARE IN AN UNPLASTICIZER STATE TO CONVERT THE CONTINUOUS FILAMENTS INTO FIBERS OF STAPLE LENGTH, AND SAPONIFYING THE FIBERS TO CONVERT THE ORGANIC ACID ESTER OF CELLULOSE TO REGENERATED CELLULOSE.
References Cited (Backward Citations)
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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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |