US4151432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ferrites for magnetostrictive vibrators
Assignee: Mitsubishi Metal Corp
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Filing: 1976-03-04
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Granted: 1979-04-24
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Expires: 1996-03-04
Abstract
Abstract A ferrite for magnetostrictrive vibrators is produced by the simple process of press forming a preformed structure formed from starting powder of magnetite or a mixture of magnetite and ferric oxide, said powder having an average particle size d ( mu ) of from 0.02 to 5.0 mu , sintering this structure in an atmosphere wherein the partial pressure of oxygen is from 10-1 to 10-11 atmosphere at a temperature of from 1,000 DEG to 1,350 DEG C. and which will meet the requirement:
Inventors
- 👤 Yumi Akimoto
- 👤 Tamotsu Ishii
- 👤 Motohiko Yoshizumi
- 👤 Sadaaki Haghino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:06
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/08; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; H; H03; H03H; H03H9/00; H03H9/22; H10; H10N; H10N35/00; H10N35/80; H10N35/85; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A supersonic magnetostrictive vibrator which comprises a magnetostrictive element of a macroscopically homogeneous sintered ferrite structure having an O/Fe atomic ratio of 4.0/3<O/Fe<4.1/3, a resonance frequency f(KHz) of from 15 to 100 KHz, a density which is at least 90% of the theoretical density and an average grain size of from 0.7 to 50μ and a positive static magnetostriction.
Claim 2
Dependent Claim
59 words
A supersonic magnetostrictive vibrator which comprises a magnetostrictive element of a macroscopically homogeneous sintered ferrite structure having an O/Fe atomic ratio of 4.0/3<O/Fe<4.1/3, a resonance frequency f(KHz) of from 15 to 100 KHz, a density which is at least 90% of the theoretical density and an average grain size of from 0.7 to 50μ and a positive static magnetostriction.
Claim 3
Dependent Claim
56 words
A supersonic magnetostrictive vibrator as claimed in claim 1 in which said magnetostrictive material is integrally provided on both sides thereof in the direction of vibration with a jig for compressing the magnetostrictive element having a structure such that the jig is capable of applying a compressing pressure of from 30 to 800 Kg/cm 2 .
Claim 4
Dependent Claim
42 words
A microscopically homogenous sintered ferrite structure having an oxygen/iron atomic ratio of 4.0/3<O/Fe<4.1/3; a resonance frequency of from 15 to 100 KHz; a density of at least 90% of the theoretical density and an average grain size of from 0.7 to 50μ.
Claim 5
Dependent Claim
42 words
A microscopically homogenous sintered ferrite structure having an oxygen/iron atomic ratio of 4.0/3<O/Fe<4.1/3; a resonance frequency of from 15 to 100 KHz; a density of at least 90% of the theoretical density and an average grain size of from 0.7 to 50μ.
Claim 6
Dependent Claim
44 words
The ferrite structure according to claim 3 which has a single phase structure of Fe 3 O 4+x where x is 0 to 0.1 having a structure wherein fine particles of Fe 2 O 3 are dispersed in a Fe 3 O 4 matrix.
Claim 7
Dependent Claim
20 words
A supersonic magnetostrictive vibrator as claimed in claim 1 in which sintered ferrite structure is a sintered magnetite ferrite structure.
Claim 8
Dependent Claim
26 words
A supersonic magnetostrictive vibrator as claimed in claim 3 in which said sintered ferrite is obtained from magnetite or a mixture of magnetite and ferric oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |