Patent US3758438A successfully refreshed from Google Patents.
US3758438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golden shade from polyesters process for the manufacture of filaments and fibers having a metallic
Assignee: Hoechst AG
•
Filing: 1971-12-10
•
Granted: 1973-09-11
•
Expires: 1991-12-10
Abstract
Abstract FILAMENTS AND FIBERS MADE FROM HIGH MOLECULAR WEIGHT SYNTHETIC LINEAR POLYESTERS HAVE A METALLIC GOLDEN ASPECT WHEN THESE CONTAIN FROM 0.001 TO 0.01% BY WEIGHT OF NIOBIUM BASED ON INCORPORATED NIOBIUM PENTOXIDE. SUCH FILAMENTS AND FIBERS ARE PREFERABLY OBTAINED BY ADDING NIOBIUM PENTOXIDE HYDRATE HAVING A DETERMINED WATER CONTENT DURING THE NORMAL POLYESTER PREPARATION PROCESS IN AN AMOUNT WHICH YIELDS A NIOBIUM CONTENT OF FROM 0.001 TO 0.01% BY WEIGHT IN THE POLYESTER END PRODUCT, AND BY SUBSEQNENTLY PROCESSING THE POLYESTER SO OBTAINED BY MELT SPINNING. ESPECIALLY MONOFILAMENTS HAVING A GOLDEN SHADE ARE USED AS FASTENING LINKS OF ZIPPERS.
Inventors
- 👤 G Freitag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; D; D01; D01F; D01F1/00; D01F1/02; D01F1/04; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |