US3763003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing ferrite thin film body
Assignee: FDK Corp
•
Filing: 1971-06-08
•
Granted: 1973-10-02
•
Expires: 1991-06-08
Abstract
Abstract A method for producing a ferrite thin film body is provided which comprises the steps of separately applying each of the metals composing the ferrite in layers on a non-magnetic heatresistant substrate, subjecting the metallic layers to a diffusion reaction under inert gas at an elevated temperature to produce a diffused solid solution, and subjecting the diffused solid solution to oxidation at an elevated temperature for a time period sufficient to change the solid solution to a ferrite body.
Inventors
- 👤 S Kobayashi
- 👤 M Torii
- 👤 K Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:57
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/007; C22C14/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
30 words
A method as claimed in claim 1, wherein said metallic layers and said substrate as the cathode are supplied with electric current while they are subjected to said diffusion reaction.
Claim 2
Dependent Claim
24 words
A method as claimed in claim 2, wherein said metallic layers are formed on said substrate, such as wire or plate, by electrochemical plating.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 3, wherein said metallic layers are formed on said substrate, such as wire or plate, by vacuum evaporation.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 2, wherein said metallic layers are formed on said substrate, such as wire or plate, by a spattering method.
Claim 5
Independent Claim
106 words
A method for producing a Cu-Mn ferrite thin film body on a non-magnetic heat-resistant substrate comprising the steps of plating Fe, Cu, and Mn respectively in layers on said substrate, subjecting said plated metallic layers to a diffusion reaction under inert gas at a temperature higher than 800*C but lower than 1083*C while said plated metallic layers and said substrate as the cathode are supplied with an electric current, said metallic layers being thereby changed to a diffused solid solution, and subjecting said solid solution to oxidation at a temperature higher than 1083*C for a sufficient time to change said solid solution to a ferrite body.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 5, wherein said substrate is a platinum wire.
Claim 7
Dependent Claim
14 words
A method as claimed in claim 5, wherein said substrate is an alumina-ceramic wire.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 6 wherein the layers are applied in the order of Fe, Cu and Mn.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |