Patent GB289727A successfully refreshed from Google Patents.
Patent US2837443A successfully refreshed from Google Patents.
US2837443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of porcelain enameling
Assignee: Eagle Picher Co
•
Filing: 1954-07-26
•
Granted: 1958-06-03
•
Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 Jason M Zander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:19
CPC Classifications
C; C23; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF TREATING A FERROUS METAL ARTICLE SURFACE, THAT COMPRISES SUBJECTING THE SURFACE TO AN ALKALINE CLEANSER SOLUTION FOLLOWED BY RINSING TO REMOVE SURFACE CONTAMINANTS AND RESIDUAL CLEANSER; SUBJECTING THE SURFACE TO AQUEOUS NITRIC ACID SOLUTION FOLLOWED BY RINSINS TO IMPART SUBSTANTIALLY UNIFORM CHEMICAL ACTIVITY TO THE SURFACE; SUBJECTING THE SURFACE TO THE AQUEOUS SULFURIC ACID-HYDROGEN SULFIDE PICKLING SOLUTION FOLLOWED BY RINSING TO ETCH THE SURFACE AND REMOVE OCCLUDED HYDROGEN, RUST, SCALE AND RESIDUAL OXIDES FROM THE NITRIC ACID TREATMENT; SUBJECTING THE SURFACE TO AQUEOUS ALKALINE CYANIDE SOLUTION FOLLOWED BY RINSING TO REMOVE SUBSTANTIALLY ALL FERROUS OXIDATION PRODUCTS; SUBJECTING THE SURFACE TO AQUEOUS NICKEL SALT SOLUTION FOLLOWED BY RINSING TO DEPOSIT A NICKEL FLASH ON THE SURFACE BY ELECTROMOTIVE DISPLACEMENT; NEUTRALIZING RESIDUAL ACID ON THE SURFACE FOLLOWED BY DRYING THE SURFACE; AND APPLYING DIRECLY TO THE SURFACE A TITANIA-OPACIFIED COVER COAT OF PORCELAIN ENAMEL.
Claim 2
Independent Claim
145 words
A METHOD OF TREATING A FERROUS METAL ARTICLE SURFACE, THAT COMPRISES SUBJECTING THE SURFACE TO AN ALKALINE CLEANSER SOLUTION FOLLOWED BY RINSING TO REMOVE SURFACE CONTAMINANTS AND RESIDUAL CLEANSER; SUBJECTING THE SURFACE TO AQUEOUS NITRIC ACID SOLUTION FOLLOWED BY RINSINS TO IMPART SUBSTANTIALLY UNIFORM CHEMICAL ACTIVITY TO THE SURFACE; SUBJECTING THE SURFACE TO THE AQUEOUS SULFURIC ACID-HYDROGEN SULFIDE PICKLING SOLUTION FOLLOWED BY RINSING TO ETCH THE SURFACE AND REMOVE OCCLUDED HYDROGEN, RUST, SCALE AND RESIDUAL OXIDES FROM THE NITRIC ACID TREATMENT; SUBJECTING THE SURFACE TO AQUEOUS ALKALINE CYANIDE SOLUTION FOLLOWED BY RINSING TO REMOVE SUBSTANTIALLY ALL FERROUS OXIDATION PRODUCTS; SUBJECTING THE SURFACE TO AQUEOUS NICKEL SALT SOLUTION FOLLOWED BY RINSING TO DEPOSIT A NICKEL FLASH ON THE SURFACE BY ELECTROMOTIVE DISPLACEMENT; NEUTRALIZING RESIDUAL ACID ON THE SURFACE FOLLOWED BY DRYING THE SURFACE; AND APPLYING DIRECLY TO THE SURFACE A TITANIA-OPACIFIED COVER COAT OF PORCELAIN ENAMEL.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |