US4014804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion removal composition
Assignee: Gultex Inc
•
Filing: 1975-04-04
•
Granted: 1977-03-29
•
Expires: 1995-04-04
Abstract
Abstract A composition comprising 2 to 10% by weight of a sulfate of copper, 0.05 to 1.0% by weight of an alkali metal bichromate, 0.05 to 1.0% by weight of a surfactant, 15 to 35% by weight of phosphoric acid (based on contained phosphoric acid) and 50 to 85% by weight of water, the total of all components equaling 100% and a method for preparing and using said composition.
Inventors
- 👤 Gordon B. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:42
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/083
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A method for preparing a corrosion removing composition, said method comprising heating water to a temperature of 140° to 160° F, dissolving therein while agitating, a sulfate of copper and an alkali metal bichromate, adding a surfactant, allowing to cool and dispersing therein phosphoric acid, the respective amounts of each of the ingredients added being sufficient to produce a composition containing 2 to 10% by weight of a sulfate of copper, 0.05 to 1.0% by weight of an alkali metal bichromate, 0.05 to 1.0% by weight of a surfactant, 15 to 35% by weight of phosphoric acid and 50 to 85% by weight of water, the total of all components being 100%.
Claim 2
Independent Claim
112 words
A method for preparing a corrosion removing composition, said method comprising heating water to a temperature of 140° to 160° F, dissolving therein while agitating, a sulfate of copper and an alkali metal bichromate, adding a surfactant, allowing to cool and dispersing therein phosphoric acid, the respective amounts of each of the ingredients added being sufficient to produce a composition containing 2 to 10% by weight of a sulfate of copper, 0.05 to 1.0% by weight of an alkali metal bichromate, 0.05 to 1.0% by weight of a surfactant, 15 to 35% by weight of phosphoric acid and 50 to 85% by weight of water, the total of all components being 100%.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal bichromate is sodium bichromate.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal bichromate is potassium dichromate.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the amount of alkali metal bichromate is 0.1 to 0.5% by weight of the composition.
Claim 6
Dependent Claim
60 words
The method of claim 1 wherein said surfactant is one selected from the group consisting of the alkyl, phenyl ethers of polyethylene glycol, dodecyl phenol adducts with ethylene oxide, trimethylalkyl ethers of polyethylene glycol, polyalkylene glycol ethers, alkyl mercaptain adducts with ethylene glycol, secondary alcohols and their ammonium sulfate salts with ethylene oxide, alkyl aryl polyether alcohols and mixtures thereof.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the amount of said surfactant is 0.05 to 0.5% by weight of said composition.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the amount of said surfactant is 0.05 to 0.3% by weight of said composition.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein the amount of phosphoric acid is 20 to 30% by weight of said composition.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the amount of water is 65 to 75% by weight of said composition.
Claim 11
Dependent Claim
13 words
The method of claim 1 wherein said sulfate of copper is cupric sulfate.
Claim 12
Dependent Claim
22 words
The method of claim 1 wherein the amount of said sulfate of copper is 4 to 8% by weight of said composition.
Claim 13
Dependent Claim
15 words
The method of claim 1 wherein the phosphoric acid solution employed is an 85% solution.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |