US3660427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-sulfato-alkylsulfonamide phthalocyanine dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1969-09-09
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Granted: 1972-05-02
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Expires: 1989-09-09
Abstract
Abstract NEW PHTHALOCYANINE DYESTUFFS CONTAINING N-SULFATOALKYSULFONAMIDE GROUPS WITH AN ARYL- OR ARALKYL RADICAL ATTACHED TO THE NITROGEN ATOM. VALUABLE DYESTUFFS FOR DYEING NITROGENOUS TEXTILE MATERIALS PURE AND LEVEL SHADES HAVING GOOD GENERAL FASTNESS PROPERTIES.
Inventors
- 👤 Gerhard Back
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:18
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/523; C09B62/537
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |