US4172787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction of α-phosphorus containing carboxylic acids with phosphorous acid to prepare scale and corrosion inhibitors
Assignee: ChampionX LLC
•
Filing: 1978-10-20
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Granted: 1979-10-30
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Expires: 1998-10-20
Abstract
Abstract Novel compounds and the use of these compounds in inhibiting corrosion and scale in open cooling systems containing ferrous materials which are: ##STR1## These compounds are prepared by a carboxylic acid-phosphonic acid interchange in the general reaction involving α-phosphorus containing carboxylic acids as reactants: --P--CH.sub.2 CO.sub.2 H →--P--CH.sub.2 PO.sub.3 H.sub.2 these compounds show activity in scale and corrosion inhibition in open air cooling systems.
Inventors
- 👤 Donald G. Ries
- 👤 Joseph P. Maniscalco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3839; C07F9/3869
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
40 words
A method of inhibiting corrosion in an aqueous system comprising adding to the system a treating agent consisting of 30-300 ppm of at least one compound selected from the group consisting of ##STR5## and alkali metal and ammonium salts thereof.
Claim 2
Independent Claim
40 words
A method of inhibiting corrosion in an aqueous system comprising adding to the system a treating agent consisting of 30-300 ppm of at least one compound selected from the group consisting of ##STR5## and alkali metal and ammonium salts thereof.
Claim 3
Dependent Claim
11 words
The method according to claim 1 wherein the compound is ##STR6##
Claim 4
Dependent Claim
11 words
The method according to claim 1 wherein the compound is ##STR7##
Claim 5
Dependent Claim
11 words
The method according to claim 1 wherein the compound is ##STR8##
Claim 6
Independent Claim
40 words
A method of inhibiting scale in an aqueous system comprising adding to the system a treating agent consisting of 5-10 ppm of at least one compound selected from the group consisting of ##STR9## and alkali metal and ammonium salts thereof.
Claim 7
Independent Claim
40 words
A method of inhibiting scale in an aqueous system comprising adding to the system a treating agent consisting of 5-10 ppm of at least one compound selected from the group consisting of ##STR9## and alkali metal and ammonium salts thereof.
Claim 8
Dependent Claim
11 words
The method according to claim 5 wherein the compound is ##STR10##
Claim 9
Dependent Claim
11 words
The method according to claim 5 wherein the compound is ##STR11##
Claim 10
Dependent Claim
11 words
The method according to claim 5 wherein the compound is ##STR12##
Claim 11
Independent Claim
40 words
A method of inhibiting corrosion in open cooling systems comprising adding to the system a treating agent consisting of 30-300 ppm of at least one compound selected from the group consisting of ##STR13## and alkali metal and ammonium salts thereof.
Claim 12
Independent Claim
40 words
A method of inhibiting corrosion in open cooling systems comprising adding to the system a treating agent consisting of 30-300 ppm of at least one compound selected from the group consisting of ##STR13## and alkali metal and ammonium salts thereof.
Claim 13
Dependent Claim
11 words
The method according to claim 9 wherein the compound is ##STR14##
Claim 14
Dependent Claim
11 words
The method according to claim 9 wherein the compound is ##STR15##
Claim 15
Dependent Claim
11 words
The method according to claim 9 wherein the compound is ##STR16##
Claim 16
Independent Claim
40 words
A method of inhibiting scale in open cooling systems comprising adding to the system a treating agent consisting of 5-10 ppm of at least one compound selected from the group consisting of ##STR17## and alkali metal and ammonium salts thereof.
Claim 17
Independent Claim
40 words
A method of inhibiting scale in open cooling systems comprising adding to the system a treating agent consisting of 5-10 ppm of at least one compound selected from the group consisting of ##STR17## and alkali metal and ammonium salts thereof.
Claim 18
Dependent Claim
11 words
The method according to claim 13 wherein the compound is ##STR18##
Claim 19
Dependent Claim
11 words
The method according to claim 13 wherein the compound is ##STR19##
Claim 20
Dependent Claim
11 words
The method according to claim 13 wherein the compound is ##STR20##
References Cited (Backward Citations)
US3297578A
Cited
US4077997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |