US3901651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating water to retard corrosion
Assignee: Aquaphase Laboratories Inc
•
Filing: 1973-03-01
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Granted: 1975-08-26
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Expires: 1993-03-01
Abstract
Abstract A method of retarding corrosion of metal parts in a water system which comprises adding a composition containing a water soluble phosphone or phosphine, a water soluble sulfonated lignin, and a water soluble cation.
Inventors
- 👤 Robert S Benner
- 👤 Larry A Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:29
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
THE METHOD OF TREATING WATER IN A WATER SYSTEM TO RETARD THE CORROSON OF THE METALS WHICH CONTACT THE WATER IN THE SYSTEM WHICH COMPRISES ADDING TO THE WATER A COMPOSITION CONSISTING ESSENTIALLY OF A WATER SOLUBLE PHOSPHONE OR PHOSPHINE IN A CONCENTRATION OF ABOUT TWO PPM TO 20 PPM, A WATER SOLUBLE SULFONATED LIGNIN IN A CONCENTRATION OF ABOUT FOUR PPM TO 20 PPM, AND A WATER SOLUBLE METAL CATION IN A CONCENTRATION OF ABOUT ONE PPM TO 10 PPM, SAID SULFONATED LIGNIN INCLUDING A COMPONENT SELECTED FROM THE GROUP CONSISTING OF PRODUCTS WHICH ARE OXIDIZABLE TO FORM A CARBOXYLIC ACID, B CARBOXYLIC ACID, OR MIXTURES OF THE TWO, SAID WATER SOLUBLE PHSPHONE OR PHOSPHINE BEING SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Independent Claim
123 words
THE METHOD OF TREATING WATER IN A WATER SYSTEM TO RETARD THE CORROSON OF THE METALS WHICH CONTACT THE WATER IN THE SYSTEM WHICH COMPRISES ADDING TO THE WATER A COMPOSITION CONSISTING ESSENTIALLY OF A WATER SOLUBLE PHOSPHONE OR PHOSPHINE IN A CONCENTRATION OF ABOUT TWO PPM TO 20 PPM, A WATER SOLUBLE SULFONATED LIGNIN IN A CONCENTRATION OF ABOUT FOUR PPM TO 20 PPM, AND A WATER SOLUBLE METAL CATION IN A CONCENTRATION OF ABOUT ONE PPM TO 10 PPM, SAID SULFONATED LIGNIN INCLUDING A COMPONENT SELECTED FROM THE GROUP CONSISTING OF PRODUCTS WHICH ARE OXIDIZABLE TO FORM A CARBOXYLIC ACID, B CARBOXYLIC ACID, OR MIXTURES OF THE TWO, SAID WATER SOLUBLE PHSPHONE OR PHOSPHINE BEING SELECTED FROM THE GROUP CONSISTING OF
Claim 3
Dependent Claim
16 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises 1-hydroxyethylidene-1, 1-diphosphonic acid.
Claim 4
Dependent Claim
17 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises pentasodium tris methyl phosphonate.
Claim 5
Dependent Claim
19 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises pentasodium, nitrilo tri (methylene phosphonic acid).
Claim 6
Dependent Claim
16 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises benzene phosphonic acid.
Claim 7
Dependent Claim
17 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises bis phosphonylmethyl phosphonic acid.
Claim 8
Dependent Claim
15 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises tri-phenyl phosphine.
Claim 9
Dependent Claim
15 words
The method set forth in claim 1 wherein said phosphone or phosphine comprises tri-butyl phosphine.
Claim 10
Dependent Claim
15 words
The method set forth in claim 1 wherein said lignin is an unmodified sulfonated lignin.
Claim 11
Dependent Claim
42 words
The method set forth in claim 1 wherein the concentration of phosphone or phosphine ranges between 10 and 20 ppm, the concentration of cation ranges between 5 and 10 ppm and the concentration of sulfonated lignin ranges between 10 and 20 ppm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |