US3032500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequestration of metal ions
Assignee: Wyeth Holdings LLC
•
Filing: 1959-12-31
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Granted: 1962-05-01
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Expires: 1979-12-31
Abstract
No abstract record available.
Inventors
- 👤 John E Milks
- 👤 Vernon P Wystrach
- 👤 Frederick H Siegele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:41
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A METHOD OF INHIBITING THE PERCIPITATION OF HEAVY METAL CATIONS FROM AN AQUEOUS SOLUTION CONTAINING SAID CATIONS WHICH COMPRISES INCORPORATING THEREIN HEAVY METAL CATION-SEQUESTERING QUANTITIES OF A SEQUESTRANT SELECTED FROM THE GROUP CONSISTING OF PHOSPHONIC ACIDS OF THE FORMULA
Claim 2
Independent Claim
39 words
A METHOD OF INHIBITING THE PERCIPITATION OF HEAVY METAL CATIONS FROM AN AQUEOUS SOLUTION CONTAINING SAID CATIONS WHICH COMPRISES INCORPORATING THEREIN HEAVY METAL CATION-SEQUESTERING QUANTITIES OF A SEQUESTRANT SELECTED FROM THE GROUP CONSISTING OF PHOSPHONIC ACIDS OF THE FORMULA
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) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |