US3565813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite chelating compositions
Assignee: Individual
•
Filing: 1967-10-02
•
Granted: 1971-02-23
•
Expires: 1987-10-02
Abstract
Abstract CHELATING COMPOSITIONS OF ENHANCED STABILITY IN USE, NAMELY, ENHANCED CAPACITY AND ABILITY TO HOLD A HEAVY METAL IN CHELATED FORM IN SOLUTION AT HIGH PH ARE FORMED BY USING IN COMBINATION PAIRS OF LIGAND SOURCES OF LIGAND TYPES, SPECIFICALLY, HYDRAZINE REACTION PRODUCTS OF SYNTHETIC POLYAMINO POLYCARBOXYLIC ACIDS TOGETHER WITH THE SYNTHETIC POLYAMINO POLYCARBOXYLIC ACIDS AND ACID SALTS IN A WIDE RANGE OF PROPORTIONS.
Inventors
- 👤 Frederick C Bersworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:31
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 0
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |