US2765308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Macrocyclic coloring compounds and process of making the same
Assignee: EIDP Inc
•
Filing: 1952-08-15
•
Granted: 1956-10-02
•
Expires: 1972-08-15
Abstract
No abstract record available.
Inventors
- 👤 John B Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:49
CPC Classifications
C; C09; C09B; C09B47/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
HEMIPORPHYRAZINE, THE SAME BEING ORGANIC, MACROCYCLIC RING COMPOUNDS WHOSE MACROCYCLIC RING STRUCTURE IS EXPRESSED BY ONE OF THE FORMULAS
Claim 2
Dependent Claim
19 words
HEMIPORPHYRAZINE, THE SAME BEING ORGANIC, MACROCYCLIC RING COMPOUNDS WHOSE MACROCYCLIC RING STRUCTURE IS EXPRESSED BY ONE OF THE FORMULAS
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) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |