US3308065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale removal, ferrous metal passivation and compositions therefor
Assignee: Dow Chemical Co
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Filing: 1963-07-22
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Granted: 1967-03-07
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Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 Chester A Lesinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/19
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A PROCESS FOR REMOVING (1) HARDNESS SCALE AND ONE OR MORE IRON OXIDE-CONTAINING DEPOSITS OF THE GROUP OF FE2O3-CONTAINING AND FE3O4 CONTAINING DEPOSITS OR (2) ONE OR MORE IRON OXIDE-CONTAINING DEPOSITS OF THE GROUP OF FE2O3-COTAINING AND FE3O4-CONTAINING DEPOSITS FROM A METAL SURFACE CONTAINING ONE OR MORE OF THE AFORESAID HARDNESS SCALE AND IRON OXIDE-CONTAINING DEPOSITS BY CONTACTING SAID METAL SURFACE WITH AN AQUEOUS ALKALINE SALINE SOLUTION HAVING A PH OF 8 TO 11 THE ACTIVE INGREDIENT OF WHICH CONSISTS OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF AMMONIUM, AMINE AND HYDROXYALKYLAMINE SALTS OF NITRILOTRIACETIC ACID, N-2-HYDROXYETHYLIMINODIACETIC ACID, ALKYLENEPOLYAMINE POLYCABOXYLIC ACIDS, SAID AMINE AND HYDROXYLALKYLAMINE HAVING SUBSTITENT GROUPS, EACH OF WHICH HAS UP TO 5 CARBON ATOMS, FOR A TIME SUFFICIENT TO DISSOLVE SAID HARDNESS SCALE AND SAID IRON OXIDE-CONTAINING DEPOSITS.
Claim 2
Dependent Claim
133 words
A PROCESS FOR REMOVING (1) HARDNESS SCALE AND ONE OR MORE IRON OXIDE-CONTAINING DEPOSITS OF THE GROUP OF FE2O3-CONTAINING AND FE3O4 CONTAINING DEPOSITS OR (2) ONE OR MORE IRON OXIDE-CONTAINING DEPOSITS OF THE GROUP OF FE2O3-COTAINING AND FE3O4-CONTAINING DEPOSITS FROM A METAL SURFACE CONTAINING ONE OR MORE OF THE AFORESAID HARDNESS SCALE AND IRON OXIDE-CONTAINING DEPOSITS BY CONTACTING SAID METAL SURFACE WITH AN AQUEOUS ALKALINE SALINE SOLUTION HAVING A PH OF 8 TO 11 THE ACTIVE INGREDIENT OF WHICH CONSISTS OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF AMMONIUM, AMINE AND HYDROXYALKYLAMINE SALTS OF NITRILOTRIACETIC ACID, N-2-HYDROXYETHYLIMINODIACETIC ACID, ALKYLENEPOLYAMINE POLYCABOXYLIC ACIDS, SAID AMINE AND HYDROXYLALKYLAMINE HAVING SUBSTITENT GROUPS, EACH OF WHICH HAS UP TO 5 CARBON ATOMS, FOR A TIME SUFFICIENT TO DISSOLVE SAID HARDNESS SCALE AND SAID IRON OXIDE-CONTAINING DEPOSITS.
Claim 3
Dependent Claim
94 words
A PROCESS FOR PASSIVATING A FERROUS METAL SURFACE BY CONTACTING SAID METAL SURFACE WITH AN A AQUEOUS ALKALINE SALINE SOLUTION WHEREIN THE SOLUTION EMPLOYED CONTAINS AS AN ESSENTIAL CONSITUENT AT LEAST ONE SALT OF THE GROUP CONSISTING OF AMMONIUM, AMINE AND HYDROXYLALKYLAMINE SALTS OF NITRILOTRIACETIC ACID, N-HYDROXYETHYLIMINODIACETIC ACID AND, ALKYLENEPOLYAMINE POLYCARBOXYLIC ACIDS, SAID AMINE AND HYDROXYLALKYLAMINE HAVING SUBSTITUENT GROUPS, EACH OF WHICH HAS UP TO 5 CARBON ATOMS, FOR A TIME SUFFICIENT TO FORM A THIN, CONTINUOUS, ADHERENT FILM OF MAGNETIC IRON OXIDE, WHEREBY SAID FERROUS METAL SURFACE IS RENDERED RESISTANT TO FURTHER OXIDATION.
Claim 4
Dependent Claim
94 words
A PROCESS FOR PASSIVATING A FERROUS METAL SURFACE BY CONTACTING SAID METAL SURFACE WITH AN A AQUEOUS ALKALINE SALINE SOLUTION WHEREIN THE SOLUTION EMPLOYED CONTAINS AS AN ESSENTIAL CONSITUENT AT LEAST ONE SALT OF THE GROUP CONSISTING OF AMMONIUM, AMINE AND HYDROXYLALKYLAMINE SALTS OF NITRILOTRIACETIC ACID, N-HYDROXYETHYLIMINODIACETIC ACID AND, ALKYLENEPOLYAMINE POLYCARBOXYLIC ACIDS, SAID AMINE AND HYDROXYLALKYLAMINE HAVING SUBSTITUENT GROUPS, EACH OF WHICH HAS UP TO 5 CARBON ATOMS, FOR A TIME SUFFICIENT TO FORM A THIN, CONTINUOUS, ADHERENT FILM OF MAGNETIC IRON OXIDE, WHEREBY SAID FERROUS METAL SURFACE IS RENDERED RESISTANT TO FURTHER OXIDATION.
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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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |