US3079288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for increasing the corrosion resistance of phosphatetype chemical conversion coatings on metal surfaces
Assignee: Henkel Corp
•
Filing: 1960-09-07
•
Granted: 1963-02-26
•
Expires: 1980-09-07
Abstract
No abstract record available.
Inventors
- 👤 Schneider George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:36
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
THE METHOD OF INCREASING THE CORROSION RESISTANCE OF METAL SURFACES WHICH CARRY A PHOSPHATE-TYPE CHEMICAL CONVERSION COATING WHICH COMPRISES TREATING THE COATED SURFACE WITH A SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID, CITRIC ACID AND WATER AND DRYING THE TREATED SURFACE, THE AMOUNT OF TOTAL INITIAL SOLIDS (IE., CITRIC ACID PLUS CHROMIC ACID) BEING FROM 1.7 TO 3.4% WEIGHT/VOLUME (I.E. GRAMS PER 100 MLS.) OF THE TREATING SOLUTION WITH THE CONCENTRATION OF CITRIC ACID BEING FROM 40 TO 50% OF THE TOTAL INITIAL SOLIDS OF THE SOLUTION AND WITH THE PH LYING BELOW ABOUT 4.5.
Claim 2
Independent Claim
94 words
THE METHOD OF INCREASING THE CORROSION RESISTANCE OF METAL SURFACES WHICH CARRY A PHOSPHATE-TYPE CHEMICAL CONVERSION COATING WHICH COMPRISES TREATING THE COATED SURFACE WITH A SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID, CITRIC ACID AND WATER AND DRYING THE TREATED SURFACE, THE AMOUNT OF TOTAL INITIAL SOLIDS (IE., CITRIC ACID PLUS CHROMIC ACID) BEING FROM 1.7 TO 3.4% WEIGHT/VOLUME (I.E. GRAMS PER 100 MLS.) OF THE TREATING SOLUTION WITH THE CONCENTRATION OF CITRIC ACID BEING FROM 40 TO 50% OF THE TOTAL INITIAL SOLIDS OF THE SOLUTION AND WITH THE PH LYING BELOW ABOUT 4.5.
Claim 3
Dependent Claim
67 words
AN AQUEOUS SOLUTION FOR TREATING CHEMICAL CONVERSION COATINGS ON THE SURFACE OF METAL SAID SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID, CITRIC ACID AND WATER, THE AMOUNT OF CITRIC ACID PLUS CHROMIC ACID BEING FROM 1.7 TO 3.4% WEIGHT/VOLUME (I.E. GRAMS PER 100 MLS.) WITH THE CONCENTRATION OF CITRIC ACID BEING FROM 40 TO 50% OF THE TOTAL, WITH THE PH OF THE SOLUTION LYING BELOW ABOUT 4.5
Claim 4
Dependent Claim
67 words
AN AQUEOUS SOLUTION FOR TREATING CHEMICAL CONVERSION COATINGS ON THE SURFACE OF METAL SAID SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID, CITRIC ACID AND WATER, THE AMOUNT OF CITRIC ACID PLUS CHROMIC ACID BEING FROM 1.7 TO 3.4% WEIGHT/VOLUME (I.E. GRAMS PER 100 MLS.) WITH THE CONCENTRATION OF CITRIC ACID BEING FROM 40 TO 50% OF THE TOTAL, WITH THE PH OF THE SOLUTION LYING BELOW ABOUT 4.5
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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |