US3728072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel acrylonitrile polymer fibers and process for producing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1969-07-23
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Granted: 1973-04-17
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Expires: 1989-07-23
Abstract
Abstract A ACRYLIC FIBER IS PROVIDED WITH PROTUBERANCES OF MORE THAN 0.2U HEIGHT AT INTERVALS IN THE RANGE OF 1.5 TO 12U ON THE PERIPHERAL SURFACE THEREOF. THIS NOVEL ACRYLIC FIBER IS MANUFACTURED BY TREATING THE FIBER WITH A DENATURALIZING AGENT SUCH AS ALKALI METAL HYDROXIDES, SULFURIC ACID, HYDROXYLAMINE SALTS, AND HYDRAZINE, AND IMMERSING THE TREATED FIBER INTO A SHRINKING AGENT SUCH AS GLYCOLS HYDROTROPIC AGENTS, METALS HAVING A LOW MELTING POINT AND ORGANIC CARBONATE OR Y-BUTYROLACTONE SOLUTIONS WHICH CAN DISSOLVE THE ACRYLONTRILE POLYMER. D R A W I N G
Inventors
- 👤 M Uchida
- 👤 H Sahara
- 👤 Z Orito
- 👤 H Sugimoto
- 👤 M Takesue
- 👤 K Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:41
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/224; D06M13/232; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 0
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |