Patent US3330897A successfully refreshed from Google Patents.
US3330897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fibers of improved elastic recovery
Assignee: Celanese Canada Inc
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Filing: 1966-08-23
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Granted: 1967-07-11
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Expires: 1986-08-23
Abstract
No abstract record available.
Inventors
- 👤 Tessier Joseph Donatien Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:45
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR THE PRODUCTION OF POLYPROPYLENE FIBERS, SAID FIBERS HAVING AN ELASTIC RECOVERY OF AT LEAST 85% WHEN STRETCHED TO 35% OF THEIR ORIGINAL LENGTH AND AN ELONGATION AT BREAK OF AT LEAST 100%, SAID PROCESS COMPRISING MELT SPINNING POLYPROPYLENE WHILE DRAWING DOWN INTO FIBERS AND SUBJECTING SAID FIBERS TO A HEAT TREATMENT UNDER NON-STRETCHING CONDITIONS AT A TEMPERATURE BELOW THE MELTING POINT THEREOF AND ABOVE 85*C., FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE SAID FIBERS HAVING SAID ELASTIC RECOVERY.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE PRODUCTION OF POLYPROPYLENE FIBERS, SAID FIBERS HAVING AN ELASTIC RECOVERY OF AT LEAST 85% WHEN STRETCHED TO 35% OF THEIR ORIGINAL LENGTH AND AN ELONGATION AT BREAK OF AT LEAST 100%, SAID PROCESS COMPRISING MELT SPINNING POLYPROPYLENE WHILE DRAWING DOWN INTO FIBERS AND SUBJECTING SAID FIBERS TO A HEAT TREATMENT UNDER NON-STRETCHING CONDITIONS AT A TEMPERATURE BELOW THE MELTING POINT THEREOF AND ABOVE 85*C., FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE SAID FIBERS HAVING SAID ELASTIC RECOVERY.
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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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |