Patent US1860865A successfully refreshed from Google Patents.
Patent US2841576A successfully refreshed from Google Patents.
US2841576A
Expired / Lapsed
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Complex metal compounds of azo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1956-04-16
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Granted: 1958-07-01
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Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Zickendraht Christian
- 👤 Buehler Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:49
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/02; C09B11/00; C09B11/04; C09B11/10; C09B11/24; C09B45/00; C09B45/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A REACTION PRODUCT OF A TRIARYLMETHANE DYESTUFF HAVING A XANTHONE RING BUT BEING FREE FROM SULFONIC ACID GROUPS WITH A COMPLEX METAL COMPOUND CONTAINING ONE ATOMS OF ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF COBALT AND CHROMIUM BOUND IN COMPLEX UNION WITH SUBSTANTIALLY TWO MOLECULES OF A MONOAZO DYESTUFF FREE FROM SULFONIC AND CARBOXYLIC ACID GROUPS AND CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
64 words
A REACTION PRODUCT OF A TRIARYLMETHANE DYESTUFF HAVING A XANTHONE RING BUT BEING FREE FROM SULFONIC ACID GROUPS WITH A COMPLEX METAL COMPOUND CONTAINING ONE ATOMS OF ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF COBALT AND CHROMIUM BOUND IN COMPLEX UNION WITH SUBSTANTIALLY TWO MOLECULES OF A MONOAZO DYESTUFF FREE FROM SULFONIC AND CARBOXYLIC ACID GROUPS AND CORRESPONDING TO THE FORMULA
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |