US2981633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating ferrous metals
Assignee: Pfizer Inc
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Filing: 1960-01-07
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Granted: 1961-04-25
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Expires: 1980-01-07
Abstract
No abstract record available.
Inventors
- 👤 Shipp C Davis
- 👤 William G Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:20
CPC Classifications
C; C23; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PROCELAIN ENAMELING OF FERROUS METAL OBJECTS COMPRISING THE STEPS OF CLEANING THE FERROUS METAL, THEN PICKLING WITH AN AQUEOUS SOLUTION OF CITRIC ACID CONTAINING FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF ACID AT A TEMPERATURE OF FROM ABOUT 160* TO ABOUT 212* F. FOR FROM ABOUT 5 TO ABOUT 30 MINUTES, THEN DEPOSITING NICKEL ON THE SURFACE IN AN AMOUNT OF FORM ABOUT 0.03 TO ABOUT 0.15 GRAM PER SQUARE FOOT, THEN COATING THE OBJECT WITH PROCELAIN ENAMEL, DRYING AT FROM ABOUT 250 TO ABOUT 400* F. AND BANKING SAME AT FROM ABOUT 1300* TO ABOUT 1550*F. FOR FROM ABOUT 3 TO ABOUT 6 MINUTES.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE PROCELAIN ENAMELING OF FERROUS METAL OBJECTS COMPRISING THE STEPS OF CLEANING THE FERROUS METAL, THEN PICKLING WITH AN AQUEOUS SOLUTION OF CITRIC ACID CONTAINING FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF ACID AT A TEMPERATURE OF FROM ABOUT 160* TO ABOUT 212* F. FOR FROM ABOUT 5 TO ABOUT 30 MINUTES, THEN DEPOSITING NICKEL ON THE SURFACE IN AN AMOUNT OF FORM ABOUT 0.03 TO ABOUT 0.15 GRAM PER SQUARE FOOT, THEN COATING THE OBJECT WITH PROCELAIN ENAMEL, DRYING AT FROM ABOUT 250 TO ABOUT 400* F. AND BANKING SAME AT FROM ABOUT 1300* TO ABOUT 1550*F. FOR FROM ABOUT 3 TO ABOUT 6 MINUTES.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |