US3077442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hard magnetic coatings of nickel-phosphorus alloys
Assignee: International Business Machines Corp
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Filing: 1960-08-19
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Granted: 1963-02-12
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Expires: 1980-08-19
Abstract
No abstract record available.
Inventors
- 👤 Koretzky Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:53
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/48; C25D5/50; H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; H01F41/26; Y; Y10; Y10S; Y10S205/00; Y10S205/922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF PREPARING A MAGNETIC COATING OF A NICKEL-PHOSPHORUS ALLOY WHICH COMPRISES SUBJECTING A SUBSTRATE TO AN ELECTROLYTIC ACTION IN AN ELECTROPLATING BATH HAVING A PH OF ABOUT 4 CONTAINING 49,38 GRAMS PER LITER OF SOLUTION OF NICKEL IONS, 9.50 GRAMS PER LITER OF SOLUTION OF HYPOPHOSPHITE IONS, AT A CURRENT DENSITY OF 25 TO 125 AMPERES PER SQUARE FOOT, THEREAFTER HEATING THE COATING THUS DEPOSITED AT ELEVATED TEMPERATURES, TO PRODUCE THEREBY A MAGNETIC COATING HAVING A COERCIVE FORCE OF ABOUT 240 OERSTEDS AND A SQUARENESS RATIO, BR/BS, OF 0.84 WHEN DRIVEN AT 1000 OERSTEDS.
Claim 2
Independent Claim
96 words
A METHOD OF PREPARING A MAGNETIC COATING OF A NICKEL-PHOSPHORUS ALLOY WHICH COMPRISES SUBJECTING A SUBSTRATE TO AN ELECTROLYTIC ACTION IN AN ELECTROPLATING BATH HAVING A PH OF ABOUT 4 CONTAINING 49,38 GRAMS PER LITER OF SOLUTION OF NICKEL IONS, 9.50 GRAMS PER LITER OF SOLUTION OF HYPOPHOSPHITE IONS, AT A CURRENT DENSITY OF 25 TO 125 AMPERES PER SQUARE FOOT, THEREAFTER HEATING THE COATING THUS DEPOSITED AT ELEVATED TEMPERATURES, TO PRODUCE THEREBY A MAGNETIC COATING HAVING A COERCIVE FORCE OF ABOUT 240 OERSTEDS AND A SQUARENESS RATIO, BR/BS, OF 0.84 WHEN DRIVEN AT 1000 OERSTEDS.
References Cited (Backward Citations)
US2643221A
Cited
US2739107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |