Patent US2544385A successfully refreshed from Google Patents.
US2544385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic fiber preparation
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-03-25
•
Granted: 1951-03-06
•
Expires: 1968-03-25
Abstract
No abstract record available.
Inventors
- 👤 Carroll A Hochwalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
IN A METHOD OF SPINNING FIBERS OF A COPOLYMER OF 75 TO 97 PERCENT ACRYLONITRILE, TWO TO 18 PERCENT METHACRYLONITRILE, AND FROM ONE TO TEN PERCENT VINYL ACETATE, BY EXTRUDING A SOLUTION OF SAID POLYMER IN BUTYROLACTONE INTO A COAGULATING BATH, AND REMOVING THE PRECIPITATED FIBER; THE STEP OF UTILIZING SODIUM HYDROXIDE SOLUTION AS THE COAGULATING BATH.
References Cited (Backward Citations)
FR883764A
Cited
US2404727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |