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Patent US2897186A successfully refreshed from Google Patents.
US2897186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazoamino dye intermediates
Assignee: Pharma Chemical Corp
•
Filing: 1956-02-21
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Granted: 1959-07-28
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Expires: 1976-02-21
Abstract
No abstract record available.
Inventors
- 👤 Miller Julius
- 👤 Guidice Dominic Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:07
CPC Classifications
C; C09; C09B; C09B39/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A DYE INTERMEDIATE HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
8 words
A DYE INTERMEDIATE HAVING THE FOLLOWING STRUCTURAL 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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |