Patent US3737437A successfully refreshed from Google Patents.
US3737437A
Expired / Lapsed
US
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Water-soluble metal phthalocyanine dyestuffs
Assignee: Cassella Farbwerke Mainkur AG
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Filing: 1972-02-29
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Granted: 1973-06-05
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Expires: 1992-02-29
Abstract
Abstract WATER-SOLUBLE METAL PHTHALOCYNANINE DYESTUFFS OF THE FORMULA (H-O3S)N-PC(-ME)-(SO2-N(-R3)-R1-SO2-R2)M AND THE PREPARATION THEREOF AND THE USE THEREOF, PARTICULARLY AS REACTIVE DYESTUFFS FOR CELLULOSE MATERIALS.
Inventors
- 👤 Brachel H Von
- 👤 F Aldebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:38
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/503; C09B62/517
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |