US3752648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving acrylic fiber articles
Assignee: Asahi Kasei Corp
•
Filing: 1970-11-25
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Granted: 1973-08-14
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Expires: 1990-11-25
Abstract
Abstract AN ACRYLIC FIBER ARTICLE IS TREATED WITH A SOLVENT FOR SAID FIBER IN A MANNER SUCH THAT THE SWELLING AND DISSOLVING ACTIONS OF SAID SOLVENT ACT ON A PORTION OF THE CROSS SECTION OF THE INDIVIDUAL FIBERS AND THEN TREATING THE RESULTANT ARTICLE WITH A TREATING AGENT CONSISTING OF SAID SOLVENT, OF WHICH THE CONCENTRATION, TEMPERATURE AND TREATING TIME HAVE BEEN ADJUSTED SO AS DISSOLVE OR DISPERSE ONLY THOSE LAYERS OF THE FIBERS ON WHICH THE SOLVENT HAS ACTED TO REMOVE SAID LAYERS THEREFROM.
Inventors
- 👤 Y Shichijo
- 👤 H Yamaguchi
- 👤 K Tsuji
- 👤 K Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:47
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/58; D06M11/64; D06M11/65
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |