Patent US4093781A successfully refreshed from Google Patents.
US4093781A
Expired / Lapsed
US
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Epitaxial, sodium-substituted lithium ferrite films
Assignee: Boeing North American Inc
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Filing: 1975-05-27
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Granted: 1978-06-06
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Expires: 1995-05-27
Abstract
Abstract A new magnetic microwave composite, a smooth monocrystalline substituted lithium ferrite (Li 1-x Na x Fe 5 O 8 ) film on a monocrystalline magnesium oxide substrate is disclosed. Lithium ferrite films may be epitaxially grown on magnesium oxide substrates with excellent lattice matching by partial substitution of sodium for the lithium to increase the lattice constant of the lithium ferrite to match that of magnesium oxide.
Inventors
- 👤 David M. Heinz
- 👤 Eugene C. Whitcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:25
CPC Classifications
C; C30; C30B; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A composite comprising a monocrystalline substrate having a lattice constant which causes single crystalline lithium ferrite disposed thereon to crack, said substrate having epitaxially disposed thereon a crackfree monocrystalline layer of lithium ferrite having sodium substituted for a portion of the lithium, said film having sodium and lithium present in a molar ratio Na/Li within a range of about 0.024 to 0.268.
Claim 2
Dependent Claim
62 words
A composite comprising a monocrystalline substrate having a lattice constant which causes single crystalline lithium ferrite disposed thereon to crack, said substrate having epitaxially disposed thereon a crackfree monocrystalline layer of lithium ferrite having sodium substituted for a portion of the lithium, said film having sodium and lithium present in a molar ratio Na/Li within a range of about 0.024 to 0.268.
Claim 3
Dependent Claim
11 words
The composite recited in claim 1 wherein the substrate is MgO.
Claim 4
Dependent Claim
47 words
A composite comprising a monocrystalline MgO substrate having epitaxialy disposed thereon a monocrystalline layer of lithium ferrite having sodium substituted for a portion of the lithium wherein the film has sodium and lithium present in a molar ratio Na/Li within a range of about 0.024 to 0.268.
Claim 5
Dependent Claim
47 words
A composite comprising a monocrystalline MgO substrate having epitaxialy disposed thereon a monocrystalline layer of lithium ferrite having sodium substituted for a portion of the lithium wherein the film has sodium and lithium present in a molar ratio Na/Li within a range of about 0.024 to 0.268.
Claim 6
Dependent Claim
19 words
The composite recited in claim 3 wherein the film is disposed on the (111) crystallographic plane of the MgO.
Claim 7
Dependent Claim
20 words
The composite recited in claim 3 in which the film is disposed on a (100) crystallographic plane of the MgO.
Claim 8
Dependent Claim
13 words
The composite recited in claim 3 wherein said molar ratio is substantially 0.024.
Claim 9
Dependent Claim
13 words
The composite recited in claim 3 wherein the molar ratio is substantially 0.121.
Claim 10
Dependent Claim
13 words
The composite recited in claim 3 wherein the molar ratio is substantially 0.268.
References Cited (Backward Citations)
US2762778A
Cited
US2945744A
Cited
US3484376A
Cited
US3193503A
Cited
US3305301A
Cited
US3223641A
Cited
US3488157A
Cited
US3498836A
Cited
US3492237A
Cited
US3486937A
Cited
US3477959A
Cited
US3630912A
Cited
DE2427944A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |