US2668167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of complex chromium azo compounds
Assignee: Cincinnati Chemical Works Inc
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Filing: 1951-11-28
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Granted: 1954-02-02
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Expires: 1971-11-28
Abstract
No abstract record available.
Inventors
- 👤 Robert P Monnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
A METHOD FOR THE PREPARATION OF A COMPLEX CHROMIUM AZO COMPOUND, WHICH COMPRISES THE STEP OF REPLACING CU BY CR IN THE COMPLEX COPPER AZO COMPOUND CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |