US2877252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy metal containing azine pigments
Assignee: Wyeth Holdings LLC
•
Filing: 1956-06-08
•
Granted: 1959-03-10
•
Expires: 1976-06-08
Abstract
No abstract record available.
Inventors
- 👤 Delton W Hein
- 👤 Robert J Alheim
- 👤 Nena K Barabutes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:01
CPC Classifications
C; C09; C09B; C09B55/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
THE PROCESS OF PRODUCING METAL CHELATES OF 2-HYDROXY-1-NAPHTHALDAZINE, WHICH COMPRISES HEATING SAID AZINE WITH A LOWER ALKANOIC ACID SALT OF A METAL OF ATOMIC NUMBER 24 TO 30 IN A MEDIUM CONSISTING ESSENTIALLY OF AN N-(LOWER ALKYL)-AMIDE OF A LOWER FATTY ACID.
Claim 2
Dependent Claim
42 words
THE PROCESS OF PRODUCING METAL CHELATES OF 2-HYDROXY-1-NAPHTHALDAZINE, WHICH COMPRISES HEATING SAID AZINE WITH A LOWER ALKANOIC ACID SALT OF A METAL OF ATOMIC NUMBER 24 TO 30 IN A MEDIUM CONSISTING ESSENTIALLY OF AN N-(LOWER ALKYL)-AMIDE OF A LOWER FATTY ACID.
Claim 3
Dependent Claim
14 words
THE PROCESS OF CLAIM 1 IN WHICH THE LOWER FATTY ACID AMIDE IS FORMYLDIMETHYLAMINE.
Claim 4
Dependent Claim
13 words
THE PROCESS OF CLAIM 2 IN WHICH THE METAL SALT IS COPPER ACETATE.
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) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |