US3360397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of chemically depositing a magnetic cobalt film from a bath containing malonate and citrate ions
Assignee: International Business Machines Corp
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Filing: 1964-04-29
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Granted: 1967-12-26
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Expires: 1984-04-29
Abstract
No abstract record available.
Inventors
- 👤 Koretzky Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:43
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/32; C23C18/34; C23C18/36; H; H01; H01F; H01F41/00; H01F41/14; H01F41/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A CHEMCIAL REDUCTION PROCESS FOR DEPOSITING ONTO A CATALYTIC SUBSTRATE MAGNETIC COBALT FILM HAVING COERCIVITY IN THE RANGE OF ABOUT 400 TO 700 OERSTEDS COMPRISING: SUBJECTING SAID SUBSTRATE TO AN AQUEOUS SOLUTION OF A COBALT SALT, AN ALKALINE HYPOPHOSPHITE, A MATERIAL WHICH PRODUCES MALONATE ION IN SOLUTION SELECTED FROM THE GROUP CONSISTING OF MALONIC ACID AND AN ALKALINE MALONATE, AND A MATERIAL WHICH PRODUCES CITRATE ION IN SOLUTION SELECTED FROM THE GROUP CONSISTING OF CITRIC ACID AND AN ALKALINE CITRATE; WHEREIN THE TOTAL AVAILABLE CONCENTRATION OF COBALT IONS IS BETWEEN ABOUT 5.7 TO 8.7 GRAMS PER LITER, THE TOTAL AVAILABLE CONCENTRATION OF HYPOPHOSPHITE IONS IS BETWEEN ABOUT 3 AND 24.5 GRAMS PER LITER, THE TOTAL AVAILABLE CONCENTRATION OF MALONATE IONS IS BETWEEN 5.1 AND 10.4 GRAMS PER LITER AND THE TOTAL AVAILABLE CONCENTRATION OF CITRATE IONS IS BETWEEN 3.9 AND 13.4 GRAMS PER LITER; AND WHEREIN THE PH OF THE SOLUTION IS MAINTAINED BETWEEN ABOUT 8 AND 11.
Claim 2
Dependent Claim
158 words
A CHEMCIAL REDUCTION PROCESS FOR DEPOSITING ONTO A CATALYTIC SUBSTRATE MAGNETIC COBALT FILM HAVING COERCIVITY IN THE RANGE OF ABOUT 400 TO 700 OERSTEDS COMPRISING: SUBJECTING SAID SUBSTRATE TO AN AQUEOUS SOLUTION OF A COBALT SALT, AN ALKALINE HYPOPHOSPHITE, A MATERIAL WHICH PRODUCES MALONATE ION IN SOLUTION SELECTED FROM THE GROUP CONSISTING OF MALONIC ACID AND AN ALKALINE MALONATE, AND A MATERIAL WHICH PRODUCES CITRATE ION IN SOLUTION SELECTED FROM THE GROUP CONSISTING OF CITRIC ACID AND AN ALKALINE CITRATE; WHEREIN THE TOTAL AVAILABLE CONCENTRATION OF COBALT IONS IS BETWEEN ABOUT 5.7 TO 8.7 GRAMS PER LITER, THE TOTAL AVAILABLE CONCENTRATION OF HYPOPHOSPHITE IONS IS BETWEEN ABOUT 3 AND 24.5 GRAMS PER LITER, THE TOTAL AVAILABLE CONCENTRATION OF MALONATE IONS IS BETWEEN 5.1 AND 10.4 GRAMS PER LITER AND THE TOTAL AVAILABLE CONCENTRATION OF CITRATE IONS IS BETWEEN 3.9 AND 13.4 GRAMS PER LITER; AND WHEREIN THE PH OF THE SOLUTION IS MAINTAINED BETWEEN ABOUT 8 AND 11.
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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) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |