Patent US4895494A successfully refreshed from Google Patents.
Patent US2873206A successfully refreshed from Google Patents.
US2873206A
Expired / Lapsed
US
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Process for the optical brightening of polyester fibers
Assignee: BASF Schweiz AG
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Filing: 1956-12-14
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Granted: 1959-02-10
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Expires: 1976-12-14
Abstract
No abstract record available.
Inventors
- 👤 Geigy Wilhelm
- 👤 Weber Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:54
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/60; D06L4/679
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF POLYESTER FIBERS, WHICH COMPRISES APPLYING TO THESE FIBERS IN AN AQUEOUS MEDUIM AT A TEMPERATURE OF A MAXIMUM OF 75* C. IN THE PRESCENE OF ASURFACE-ACTIVE SUBSTANCE A BRIGHTENING AGENT WHICH IS FREE FROM WATER-SOLUBLIZING GROUPS AND CONTAINS AT LEAST ONE HETEROCYCLIC RING CONDENSED WITH A BENZENE RING, AND THEN SUBJECTING THE FIBERS TO A DRY HEAT TREATMENT AT A TEMPERATURE ABOVE 1000* C.
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF POLYESTER FIBERS, WHICH COMPRISES APPLYING TO THESE FIBERS IN AN AQUEOUS MEDUIM AT A TEMPERATURE OF A MAXIMUM OF 75* C. IN THE PRESCENE OF ASURFACE-ACTIVE SUBSTANCE A BRIGHTENING AGENT WHICH IS FREE FROM WATER-SOLUBLIZING GROUPS AND CONTAINS AT LEAST ONE HETEROCYCLIC RING CONDENSED WITH A BENZENE RING, AND THEN SUBJECTING THE FIBERS TO A DRY HEAT TREATMENT AT A TEMPERATURE ABOVE 1000* C.
References Cited (Backward Citations)
US2483392A
Cited
US2649385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |