US3094441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromic phosphate bonding coats for metal
Assignee: Individual
•
Filing: 1958-09-03
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Granted: 1963-06-18
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Expires: 1978-09-03
Abstract
No abstract record available.
Inventors
- 👤 Curtin Leo Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33; Y; Y10; Y10S; Y10S264/00; Y10S264/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
PROCESS FOR PRODUCING AN ADHERENT, CHROMIC PHOSPHATE BONDING COAT ON A METAL BASE SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND FERROUS METAL WHICH COMPRISES, (1) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING A CHROMIC ACID COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE CHROMIC ACID AND AMMONIUM BICHROMATE, THE SOLUTION ALSO CONTAINING A REDUCING AGENT FOR SAID CHROMIC ACID COMPOUND, SAID REDUCING AGENT BEING PRESENT IN AMOUNT SUFFICIENT TO REDUCE SUBSTANTIALLY COMPLETELY THE HEXAVALENT CHROMIUM PRESENT, THE SOLUTION ALSO CONTAINING A PHOSPHORIC ACID COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE PHOSPHORIC ACID AND AMMONIUM DIHYDROGEN PHOSPHATE, THE PHOSPHORIC ACID COMPOUND BEING PRESENT IN AMOUNT OF ABOUT 0.51 MOLE TO 2.90 MOLES FOR EACH MOLE OF CHROMIC ACID COMPOUND, CRO3, AND 82) HEATING THE METAL CARRYING THE FILM OF CHROMIC ACID COMPOUND TO A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 400*C. WITH REDUCTION OF HEXAVALENT CHROMIUM TO THE TRIVALENT STATE AND FORMATION OF AN ADHERENT BONDING COAT WHICH IS CHIEFLY PHOSPHATES OF TRIVALENT CHROMIUM.
Claim 2
Dependent Claim
167 words
PROCESS FOR PRODUCING AN ADHERENT, CHROMIC PHOSPHATE BONDING COAT ON A METAL BASE SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND FERROUS METAL WHICH COMPRISES, (1) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING A CHROMIC ACID COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE CHROMIC ACID AND AMMONIUM BICHROMATE, THE SOLUTION ALSO CONTAINING A REDUCING AGENT FOR SAID CHROMIC ACID COMPOUND, SAID REDUCING AGENT BEING PRESENT IN AMOUNT SUFFICIENT TO REDUCE SUBSTANTIALLY COMPLETELY THE HEXAVALENT CHROMIUM PRESENT, THE SOLUTION ALSO CONTAINING A PHOSPHORIC ACID COMPOUND SELECTED FROM THE CLASS CONSISTING OF FREE PHOSPHORIC ACID AND AMMONIUM DIHYDROGEN PHOSPHATE, THE PHOSPHORIC ACID COMPOUND BEING PRESENT IN AMOUNT OF ABOUT 0.51 MOLE TO 2.90 MOLES FOR EACH MOLE OF CHROMIC ACID COMPOUND, CRO3, AND 82) HEATING THE METAL CARRYING THE FILM OF CHROMIC ACID COMPOUND TO A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 400*C. WITH REDUCTION OF HEXAVALENT CHROMIUM TO THE TRIVALENT STATE AND FORMATION OF AN ADHERENT BONDING COAT WHICH IS CHIEFLY PHOSPHATES OF TRIVALENT CHROMIUM.
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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |