Patent US2848469A successfully refreshed from Google Patents.
US2848469A
Expired / Lapsed
US
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Polyhydroxyethyl polycarboxymethyl polyamines and chelates
Assignee: Novartis Corp
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Filing: 1954-08-13
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Granted: 1958-08-19
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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
2026-10-28 08:46
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; E; E21; E21B; E21B37/00; E21B37/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A WATER-SOLUBLE METAL CHELATE OF N,N'',N"-TRIHYDROXYETHYL N,N"-DICARBOXYMETHYL DIETHYLENETRIAMINE WITH A POLYVALENT METAL.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |