US3668094A
Expired / Lapsed
US
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Novel glassy compositions zinc and alpha hydroxy diphosphonic acids
Assignee: Calgon Corp
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Filing: 1970-10-16
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Granted: 1972-06-06
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Expires: 1990-10-16
Abstract
Abstract Novel alkali metal zinc and ammonium zinc glasses of alpha hydroxy diphosphonic acids are disclosed along with the use of these glassy compositions in small concentrations to inhibit corrosion and scale formation in aqueous systems.
Inventors
- 👤 George Birdseye Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:25
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/939
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
A composition as in claim 1 wherein ''''R'''' is methyl and ''''M'''' is sodium.
Claim 2
Dependent Claim
14 words
A composition as in claim 1 wherein ''''R'''' is phenyl and ''''M'''' is sodium.
Claim 3
Independent Claim
76 words
A method of inhibiting the corrosion of metals in a water system comprising maintaining in the water of said system at least about 5 ppm of a composition of the formula group of one to five carbon atoms, phenyl or benzyl and ''''M'''' is selected from the group consisting of an alkali metal, ammonium, or combinations thereof and where x is 1 and y is from 1 to 1.75 and z is from 0.25 to 1.0.
Claim 4
Dependent Claim
13 words
A method of claim 4 wherein ''''R'''' is methyl and ''''M'''' is sodium.
Claim 5
Dependent Claim
13 words
A method of claim 4 wherein ''''R'''' is phenyl and ''''M'''' is sodium.
Claim 6
Independent Claim
105 words
A method of inhibiting the corrosion of cuprous containing metals in a water system comprising maintaining in the water of said system at least about 5 ppm of a composition of the formula group of one to five carbon atoms, phenyl or benzyl and ''''M'''' is selected from the group consisting of an alkali metal, ammonium, or combinations thereof and where x is 1 and y is from 1 to 1.75 and z is from 0.25 to 1,0, and at least about 0.05 ppm of a compound selected from the group consisting of 1,2,3 triazoles, thiols of thiazoles, thiols of oxazoles, and thiols of imidazoles.
Claim 7
Dependent Claim
80 words
Method of inhibiting the precipitation of scale-forming salts in an aqueous system and inhibiting the corrosion of metals in said system comprising treating the water of said system with a composition of the formula alkyl group of one to five carbon atoms, phenyl or benzyl and ''''M'''' is selected from the group consisting of an alkali metal, ammonium, or combinations thereof and where x is 1 and y is from 1 to 1.75 and z is from 0.25 to 1.0.
Claim 8
Independent Claim
77 words
A method of inhibiting the precipitation of scale-forming salts in an aqueous system comprising maintaining in the water of said system a threshold amount of a cOmposition of the formula an alkyl group of one to five carbon atoms, phenyl or benzyl and ''''M'''' is selected from the group consisting of an alkali metal, ammonium, or combinations thereof and where x is 1 and y is from 1 to 1.75 and z is from 0.25 to 1.0.
Claim 9
Dependent Claim
12 words
Method of claim 8 wherein ''''R'''' is methyl and ''''M'''' is sodium.
Claim 10
Dependent Claim
12 words
Method of claim 8 wherein ''''R'''' is phenyl and ''''M'''' is sodium.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |