US2758003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of polyacrylonitrile fiber with ethylene diamine and product resulting therefrom
Assignee: Bayer AG
•
Filing: 1949-11-30
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Granted: 1956-08-07
•
Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Kleiner Helmut
- 👤 Brenschede Willy
- 👤 Bayer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:34
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/325; D06M13/335; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; D06M13/328; D06M13/332; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/645; D06P3/00; D06P3/70; D06P5/00; D06P5/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PROCESS FOR IMPROVING THE TENSILE STRENGTH AT ELEVATED TEMPERATURES OF A STRETCHED POLYACRYLONITRILE FIBER, WHICH COMPRISES IMMERSING SAID FIBER IN A BATH CONSISTING ESSENTIALLY OF BOILING ETHYLENE DIAMINE FOR A
Claim 2
Dependent Claim
31 words
A PROCESS FOR IMPROVING THE TENSILE STRENGTH AT ELEVATED TEMPERATURES OF A STRETCHED POLYACRYLONITRILE FIBER, WHICH COMPRISES IMMERSING SAID FIBER IN A BATH CONSISTING ESSENTIALLY OF BOILING ETHYLENE DIAMINE FOR A
References Cited (Backward Citations)
US1984417A
Cited
US2420565A
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US2445042A
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US2404720A
Cited
GB613817A
Cited
US2563662A
Cited
US2497526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |