Patent US3617575A successfully refreshed from Google Patents.
US3617575A
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US
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Process of treating aqueous solutions with an ethane triphosphonic acid compound
Assignee: Procter and Gamble Co
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Filing: 1970-02-05
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Granted: 1971-11-02
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Expires: 1990-02-05
Abstract
Abstract Aqueous solutions containing polyvalent metal ions are treated by adding an effective amount of a sequestering ethane triphosphonic acid compound.
Inventors
- 👤 Oscar T Quimby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:19
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/36; C11D3/361; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4025
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A process of treating aqueous solutions according to claim 1 in which the amount of sequestering compound added is in the range of from 0.25 to 10,000 p.p.m. of the aqueous solution.
References Cited (Backward Citations)
US3351558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |