US3011907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating ferrous metals
Assignee: Pfizer Inc
•
Filing: 1960-08-24
•
Granted: 1961-12-05
•
Expires: 1980-08-24
Abstract
No abstract record available.
Inventors
- 👤 Shipp C Davis
- 👤 William G Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:02
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/088; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS WHICH COMPRISES PICKLING CLEAN FERROUS METAL OBJECTS WITH AN AQUEOUS SOLUTION OF CITRIC ACID CONTAINING FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF ACID TOGETHER WITH A REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL THIOSULFATES AND ALKALI METAL SULFITES, THE CONCENTRATION OF ALKALI METAL THIOSULFATE BEING FROM ABOUT 0.0012 TO ABOUT 0.0030 MOLE PER GALLON AND THE CONCENTRATION OF ALKALI METAL SULFITE BEING FROM ABOUT 0.0018 TO ABOUT 0.0042 MOLE PER GALLON AT A TEMPERATURE OF FROM ABOUT 160* TO ABOUT 212*F. FRO FROM ABOUT 3 TO ABOUT 15 MINUTES, DEPOSITING ON THE SURFACES THEREOF FROM ABOUT 0.03 TO ABOUT 0.15 GM OF NICKLE PER SQ. FT., APPLYING A PORCELAIN ENAMEL COATING, DRYING AT FROM ABOUT 250* TO ABOUT 400*F. AND BAKING AT FROM ABOUT 1300* TO ABOUT 1550*F. FOR FROM ABOUT 3 TO ABOUT 6 MINUTES.
Claim 2
Dependent Claim
142 words
A PROCESS WHICH COMPRISES PICKLING CLEAN FERROUS METAL OBJECTS WITH AN AQUEOUS SOLUTION OF CITRIC ACID CONTAINING FROM ABOUT 5% TO ABOUT 20% BY WEIGHT OF ACID TOGETHER WITH A REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL THIOSULFATES AND ALKALI METAL SULFITES, THE CONCENTRATION OF ALKALI METAL THIOSULFATE BEING FROM ABOUT 0.0012 TO ABOUT 0.0030 MOLE PER GALLON AND THE CONCENTRATION OF ALKALI METAL SULFITE BEING FROM ABOUT 0.0018 TO ABOUT 0.0042 MOLE PER GALLON AT A TEMPERATURE OF FROM ABOUT 160* TO ABOUT 212*F. FRO FROM ABOUT 3 TO ABOUT 15 MINUTES, DEPOSITING ON THE SURFACES THEREOF FROM ABOUT 0.03 TO ABOUT 0.15 GM OF NICKLE PER SQ. FT., APPLYING A PORCELAIN ENAMEL COATING, DRYING AT FROM ABOUT 250* TO ABOUT 400*F. AND BAKING 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) | 1964-12-04 | 1965-06-05 | 1965-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-04 | 1969-06-05 | 1969-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-04 | 1973-06-05 | 1973-12-05 | $7700.00 | Window Closed / Lapsed |