Patent US3591576A successfully refreshed from Google Patents.
US3591576A
Expired / Lapsed
US
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Calcium or manganese lakes of phenylazo-naphthol acid dyestuffs
Assignee: Bayer AG
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Filing: 1968-05-24
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Granted: 1971-07-06
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Expires: 1988-05-24
Abstract
Abstract 1-((2-(HO3S-),4-(O2N-)PHENYL)-N=N-),2-HO,3-(HOOC-),6- (HO3S-)NAPHTHALENE ARE PRODUCED FOR USE AS PIGMENT DYESTUFFS, ADAPTED FOR INCORPORATION IN LACQUERS AND VARNISHES, SYNTHETIC MATERIALS, SPINNING MASSES AND IN THE FIELD OF PAPER AND TEXTILE PRINTING. THE LAKES EXHIBIT PARTICULARLY GOOD LIGHT FASTNESS PROPERTIES. CALCIUM OR MANGANESE LAKES OF THE AXO DYESTUFF OF THE FORMULA
Inventors
- 👤 Heinz Haubrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:47
CPC Classifications
C; C09; C09B; C09B63/00; C09B63/005; C09B45/00; C09B45/38; C09B45/46
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |