Patent US979398A successfully refreshed from Google Patents.
Patent US2938841A successfully refreshed from Google Patents.
US2938841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of zirconium for cold working
Assignee: Olin Corp
•
Filing: 1956-04-13
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Granted: 1960-05-31
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Kenneth H Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:44
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/38; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12708; Y10T428/12715; Y10T428/12722; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/12806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
THE PROCESS FOR PREPARING ZIRCONIUM FOR COLD WORKING WHICH COMPRISES REMOVING THE OXIDE SCALE IN AN AQUEOUS SOLUTION OF ABOUT 300 TO ABOUT 700 GRAMS NICKEL SULFATE PER LITER, FLUORIDE IONS IN A CONCENTRATION EQUIVALENT TO FROM ABOUT 15 TO ABOUT 30 MILLILITERS OF 48 PERCENT HYDROFLUORIC ACID PER LITER AND HYDROGEN PEROXIDE, COATING THE THUS CLEANED ZIRCONIUM WITH A METAL SELECTED FROM THE GROUP CONSISTING OF TIN AND ZINC BY IMMERSING IT IN AN AQUEOUS SOLUTION SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS OF TIN IONS AT LEAST EQUIVALENT TO ABOUT 54 GRAMS PER LITER OF STANNOUS SULFATE WITH FROM ABOUT 15 TO ABOUT 30 MILLITERS OF 48% HYDROFLUORIC ACID PER LITER AND SOLUTIONS OF ZINC IONS CONTAINING FROM ABOUT 800 GRAMS TO ABOUT 1600 GRAMS PER LITER OF ZINC SULFATE (ZNSO4 7H2O), ABOUT 15 TO 30 MILLILITERS OF 48% HYDROFLUORIC ACID PER LITER AND FROM ABOUT 15 TO ABOUT 30 GRAMS PER LITER OF ALUMINUM SULFATE, ELECTROLYTICALLY DEPOSITISNG A FILM OF COPPER ON THE RESULTING SURFACE, AND THEREAFTER DEPOSITING A COATING OF A DUCTILE METAL OVER THE COPPER FILM.
Claim 2
Dependent Claim
181 words
THE PROCESS FOR PREPARING ZIRCONIUM FOR COLD WORKING WHICH COMPRISES REMOVING THE OXIDE SCALE IN AN AQUEOUS SOLUTION OF ABOUT 300 TO ABOUT 700 GRAMS NICKEL SULFATE PER LITER, FLUORIDE IONS IN A CONCENTRATION EQUIVALENT TO FROM ABOUT 15 TO ABOUT 30 MILLILITERS OF 48 PERCENT HYDROFLUORIC ACID PER LITER AND HYDROGEN PEROXIDE, COATING THE THUS CLEANED ZIRCONIUM WITH A METAL SELECTED FROM THE GROUP CONSISTING OF TIN AND ZINC BY IMMERSING IT IN AN AQUEOUS SOLUTION SELECTED FROM THE GROUP CONSISTING OF SOLUTIONS OF TIN IONS AT LEAST EQUIVALENT TO ABOUT 54 GRAMS PER LITER OF STANNOUS SULFATE WITH FROM ABOUT 15 TO ABOUT 30 MILLITERS OF 48% HYDROFLUORIC ACID PER LITER AND SOLUTIONS OF ZINC IONS CONTAINING FROM ABOUT 800 GRAMS TO ABOUT 1600 GRAMS PER LITER OF ZINC SULFATE (ZNSO4 7H2O), ABOUT 15 TO 30 MILLILITERS OF 48% HYDROFLUORIC ACID PER LITER AND FROM ABOUT 15 TO ABOUT 30 GRAMS PER LITER OF ALUMINUM SULFATE, ELECTROLYTICALLY DEPOSITISNG A FILM OF COPPER ON THE RESULTING SURFACE, AND THEREAFTER DEPOSITING A COATING OF A DUCTILE METAL OVER THE COPPER FILM.
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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) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |