US3156578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel pickling process for application of one-coat enamel
Assignee: General Electric Co
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Filing: 1961-05-24
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Granted: 1964-11-10
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Expires: 1981-05-24
Abstract
No abstract record available.
Inventors
- 👤 Evan M Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:34
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/085; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
THE METHOD OF TREATING A STEEL SURFACE PREPARATORY TO THE APPLICATION OF A NICKEL FLASH COATING FOLLOWED BY A SINGLE FINISH COAT OF ENAMEL WHICH METHOD COMPRISES THE STEPS OF CLEANING SAID SURFACE IN AN AQUEOUS ALKALI CLEANING BATH, PICKLING THE CLEANED SURFACE IN A HOT AQUEOUS PACKLING BATH CONTAINING, BY WEIGHT, FROM 0.5 TO 2.0 PERCENT SULFURIC ACID AND FROM 0.2 TO 1.0% NITRIC ACID AND HAVING A CONTROLLED FERRIC AND FERROUS ION CONCENTRATION EQUIVALENT TO 0.1 TO 0.5 PERCENT BY WEIGHT FERRIC IRON AND 0.2 TO 3 PERCENT BY WEIGHT OF FERROUS IRON TO REMOVE FROM THE SURFACE OF SAID ARTICLE FROM 1.5 TO 3.0 GRAMS OF IRON PER SQUARE FOOT OF EXPOSED SURFACE, AND THEREAFTER RINSING THE PICKLED SURFACE WITH AN AQUEOUS SOLUTION OF FROM 0.5 TO 5.0 PERCENT BY WEIGHT OF SULFURIC ACID, SAID PICKLING BATH BEING MAINTAINED AT A SPECIFIC GRAVITY OF ABOUT 1.0 TO 1.08 AT 165*F. BY THE REPLACEMENT OF PORTIONS OF SAID BATH WITH WATER AND AT A PH OF FROM .7 TO 1.2 BY THE ADDITION OF SULFURIC ACID AND NITRIC ACID IN THE PROPORTIONS OF ABOUT 2.8 PARTS BY WEIGHT OF SULFURIC ACID TO 1 PART BY WEIGHT OF NITRIC ACID.
Claim 2
Independent Claim
201 words
THE METHOD OF TREATING A STEEL SURFACE PREPARATORY TO THE APPLICATION OF A NICKEL FLASH COATING FOLLOWED BY A SINGLE FINISH COAT OF ENAMEL WHICH METHOD COMPRISES THE STEPS OF CLEANING SAID SURFACE IN AN AQUEOUS ALKALI CLEANING BATH, PICKLING THE CLEANED SURFACE IN A HOT AQUEOUS PACKLING BATH CONTAINING, BY WEIGHT, FROM 0.5 TO 2.0 PERCENT SULFURIC ACID AND FROM 0.2 TO 1.0% NITRIC ACID AND HAVING A CONTROLLED FERRIC AND FERROUS ION CONCENTRATION EQUIVALENT TO 0.1 TO 0.5 PERCENT BY WEIGHT FERRIC IRON AND 0.2 TO 3 PERCENT BY WEIGHT OF FERROUS IRON TO REMOVE FROM THE SURFACE OF SAID ARTICLE FROM 1.5 TO 3.0 GRAMS OF IRON PER SQUARE FOOT OF EXPOSED SURFACE, AND THEREAFTER RINSING THE PICKLED SURFACE WITH AN AQUEOUS SOLUTION OF FROM 0.5 TO 5.0 PERCENT BY WEIGHT OF SULFURIC ACID, SAID PICKLING BATH BEING MAINTAINED AT A SPECIFIC GRAVITY OF ABOUT 1.0 TO 1.08 AT 165*F. BY THE REPLACEMENT OF PORTIONS OF SAID BATH WITH WATER AND AT A PH OF FROM .7 TO 1.2 BY THE ADDITION OF SULFURIC ACID AND NITRIC ACID IN THE PROPORTIONS OF ABOUT 2.8 PARTS BY WEIGHT OF SULFURIC ACID TO 1 PART BY WEIGHT OF NITRIC ACID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |