US2709178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N, n'-tetra-acetic acids
Assignee: Novartis AG
•
Filing: 1951-10-15
•
Granted: 1955-05-24
•
Expires: 1971-10-15
Abstract
No abstract record available.
Inventors
- 👤 Schlapfer Hans
- 👤 Bindler Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/12; C07C227/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
THE N.N'' -TETRA-ACETIC ACIDS OF THE GENERAL FORMULA: WHEREIN N REPRESENTS AN INTEGER FROM 0 TO 5.
Claim 2
Dependent Claim
17 words
THE N.N'' -TETRA-ACETIC ACIDS OF THE GENERAL FORMULA: WHEREIN N REPRESENTS AN INTEGER FROM 0 TO 5.
References Cited (Backward Citations)
US2316606A
Cited
US2413856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |