Patent US4101441A successfully refreshed from Google Patents.
US4101441A
Expired / Lapsed
US
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Composition and method of inhibiting corrosion
Assignee: Chemed Corp
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Filing: 1976-07-21
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Granted: 1978-07-18
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Expires: 1996-07-21
Abstract
Abstract The invention disclosed provides a new composition and method for inhibiting corrosion. The present composition is relatively non-toxic, contains no chromates, and consists essentially of an azole, water-soluble phosphate and water-soluble organophosphonic acid. Effective amounts of the corrosion inhibiting composition are used to provide corrosion protection in both ferrous and non-ferrous metals.
Inventors
- 👤 Chih Ming Hwa
- 👤 Jose T. Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A non-chromate-containing corrosion inhibiting composition which consists essentially of 1 to 80 weight percent azole, 0.1 to 98 weight percent water-soluble phosphate and 1 to 85 weight percent of water-soluble organophosphonic acid, water-soluble salts and esters thereof, said azole being a member of the group consisting of triazoles, pyrazoles, imidazoles, isoxazoles, oxazoles, isothiazoles, thiazoles, and mixtures thereof, said water soluble phosphate being selected from the group consisting of phosphoric acid, disodium phosphate, dipotassium phosphate, sodium tripolyphosphate, tetrapotassium pyrophosphate and tetrasodium pyrophosphate, and said organophosphonic acid having the formula ##STR14## in which q = 1 - 10.
Claim 2
Dependent Claim
96 words
A non-chromate-containing corrosion inhibiting composition which consists essentially of 1 to 80 weight percent azole, 0.1 to 98 weight percent water-soluble phosphate and 1 to 85 weight percent of water-soluble organophosphonic acid, water-soluble salts and esters thereof, said azole being a member of the group consisting of triazoles, pyrazoles, imidazoles, isoxazoles, oxazoles, isothiazoles, thiazoles, and mixtures thereof, said water soluble phosphate being selected from the group consisting of phosphoric acid, disodium phosphate, dipotassium phosphate, sodium tripolyphosphate, tetrapotassium pyrophosphate and tetrasodium pyrophosphate, and said organophosphonic acid having the formula ##STR14## in which q = 1 - 10.
Claim 3
Dependent Claim
13 words
The composition of claim 1 disposed in 1 to 70 weight percent water.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the azole is present in an amount of 15 to 50 weight percent.
Claim 5
Dependent Claim
30 words
A method for preventing corrosion of metals in contact with an aqueous liquid comprising maintaining in the aqueous liquid from 0.1 to 50,000 ppm. of the composition of claim 1.
References Cited (Backward Citations)
US3803047A
Cited
US3723333A
Cited
US3714066A
Cited
US3679592A
Cited
US3751372A
Cited
US3837803A
Cited
US3935125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |