Patent US2864815A successfully refreshed from Google Patents.
US2864815A
Expired / Lapsed
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Method of preparing formazane dyestuffs
Assignee: CARBOCHIMIQUE SA
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Filing: 1953-09-14
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Granted: 1958-12-16
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Expires: 1973-09-14
Abstract
No abstract record available.
Inventors
- 👤 Ziegler Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:56
CPC Classifications
C; C09; C09B; C09B50/00; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
THE METHOD OF PRODUCING METAL COMPLEXES OF MESOARYL FORMAZANE DYESTUFFS SELECTED FROM THE GROUP CONSISTING OF COPPER AND NICKEL COMPLEXES OF MESO-ARYL FORMAZANES HAVING THE STRUCTURAL FORMULA
Claim 2
Independent Claim
27 words
THE METHOD OF PRODUCING METAL COMPLEXES OF MESOARYL FORMAZANE DYESTUFFS SELECTED FROM THE GROUP CONSISTING OF COPPER AND NICKEL COMPLEXES OF MESO-ARYL FORMAZANES HAVING THE STRUCTURAL FORMULA
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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |