Patent US3642955A successfully refreshed from Google Patents.
US3642955A
Expired / Lapsed
US
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Dyeable polypropylene fibers
Assignee: Novartis Corp
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Filing: 1969-08-01
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Granted: 1972-02-15
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Expires: 1989-08-01
Abstract
Abstract DYEABILITY OF POLYPROPYLENE IS SUBSTANTIALLY IMPROVED BY BLENDING WITH THE POLYOLEFIN A COPOLYMER OF 2-METHYL-5VINYL PYRIDINE AND VINYL ACETATE OR VINYL ALCHOL. THE AMOUNT OF THE PYRIDINE COPOLYMERS EMPLOYED MAY RANGE FROM 1 TO 15 PERCENT BY WEIGHT.
Inventors
- 👤 David E O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:45
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L2203/00; C08L2203/12; C08L29/00; C08L29/02; C08L29/04; C08L39/00; C08L39/04; C08L39/08; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/928; Y10S8/932
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |