Patent US2831885A successfully refreshed from Google Patents.
US2831885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyethyl polycarboxymethyl polyamines
Assignee: Novartis Corp
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Filing: 1954-08-13
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Granted: 1958-04-22
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Expires: 1974-08-13
Abstract
No abstract record available.
Inventors
- 👤 Kroll Harry
- 👤 Knell Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:16
CPC Classifications
C; C05; C05F; C05F11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A MEMBER OF THE CALSS CONSISTING OF (A) N-HYDROXYETHYL N,N'',N",N"-TETRACARBOXYMETHYL DEIETHYLENETRIAMINE; (B) N,N-DIHYDEOXYETHYL N'',N",("-TRICABOXYMETHYL DIETHYLENETRIAMINE; (C) THE WATER-SOLUBLE SALTS OF (A) AND (B) WITH MONOVALENT CATIONS; (D) THE WATERSOLUBLE CHELATES OF (A), (B) AND (C) WITH POLYVALENT METALS; AND AQUEOUS SOLUTIONS OF (A), (B), (C) AND (D).
Claim 2
Dependent Claim
47 words
A MEMBER OF THE CALSS CONSISTING OF (A) N-HYDROXYETHYL N,N'',N",N"-TETRACARBOXYMETHYL DEIETHYLENETRIAMINE; (B) N,N-DIHYDEOXYETHYL N'',N",("-TRICABOXYMETHYL DIETHYLENETRIAMINE; (C) THE WATER-SOLUBLE SALTS OF (A) AND (B) WITH MONOVALENT CATIONS; (D) THE WATERSOLUBLE CHELATES OF (A), (B) AND (C) WITH POLYVALENT METALS; AND AQUEOUS SOLUTIONS OF (A), (B), (C) AND (D).
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |