US4042519A
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Ferrimagnetic glass-ceramics
Assignee: OI Glass Inc
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Filing: 1973-02-16
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Granted: 1977-08-16
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Expires: 1993-02-16
Abstract
Abstract Disclosed are ferrimagnetic glass-ceramics prepared by the in situ, thermal crystallization of certain nickel-zinc; manganese-zinc; and manganese-magnesium crystalline ferrites in a residual glassy matrix.
Inventors
- 👤 Edward A. Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0081; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
A homogeneous thermally crystallizable glass composition consisting essentially of: ______________________________________
COMPONENT WEIGHT %
______________________________________
K.sub.2 O 2 - 20
SiO.sub.2 30 - 60
Fe.sub.2 O.sub.3 15 - 45
ZnO 0 - 20
MgO 0 - 10
MO 3 - 25
wherein MO is
NiO 0 - 20
MnO 0 - 20
______________________________________ wherein Fe 2 O 3 , ZnO, NiO, MnO and MgO are present in the proportions defined by ZnO 1 -x MO x Fe 2 O 3 , wherein x is a whole or fractional number ranging from 0.1 to 1 inclusively; or MgO 0 .5 MnO 0 .5 Fe 2 O 3 .
Claim 2
Dependent Claim
106 words
A homogeneous thermally crystallizable glass composition consisting essentially of: ______________________________________
COMPONENT WEIGHT %
______________________________________
K.sub.2 O 2 - 20
SiO.sub.2 30 - 60
Fe.sub.2 O.sub.3 15 - 45
ZnO 0 - 20
MgO 0 - 10
MO 3 - 25
wherein MO is
NiO 0 - 20
MnO 0 - 20
______________________________________ wherein Fe 2 O 3 , ZnO, NiO, MnO and MgO are present in the proportions defined by ZnO 1 -x MO x Fe 2 O 3 , wherein x is a whole or fractional number ranging from 0.1 to 1 inclusively; or MgO 0 .5 MnO 0 .5 Fe 2 O 3 .
Claim 3
Dependent Claim
37 words
The glass composition of claim 1 consisting essentially of: ______________________________________
COMPONENT WEIGHT %
______________________________________
K.sub.2 O 5 - 15
SiO.sub.2 35 - 55
Fe.sub.2 O.sub.3 20 - 40
ZnO 3 - 17
MO 5 - 20
______________________________________
Claim 4
Dependent Claim
79 words
A ferrimagnetic glass-ceramic article comprising a substantially uniform dispersion of a ferrimagnetic crystalline phase of the spinel structure defined by the formula ZnO 1 -x MO x Fe 2 O 3 , wherein x is a whole or fractional number ranging from 0.1 to 1 inclusively; or MgO 0 .5 MnO 0 .5 Fe 2 O 3 in a residual glassy matrix, said article having been formed by the in-situ thermal crystallization of the glass composition of claim 2.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein x ranges from 0.3 to 1.
Claim 6
Dependent Claim
13 words
The glass composition of claim 1 wherein MnO and MgO are substantially absent.
Claim 7
Dependent Claim
40 words
A ferrimagnetic glass-ceramic article comprising a substantially uniform dispersion of a ferrimagnetic crystalline phase of the spinel structure in a residual glassy matrix, said article having been formed by the in-situ thermal crystallization of the glass composition of claim 5.
Claim 8
Dependent Claim
13 words
The glass composition of claim 1 wherein MgO and NiO are substantially absent.
Claim 9
Dependent Claim
40 words
A ferrimagnetic glass-ceramic article comprising a substantially uniform dispersion of a ferrimagnetic crystalline phase of the spinel structure in a residual glassy matrix, said article having been formed by the in-situ thermal crystallization of the glass composition of claim 7.
Claim 10
Dependent Claim
13 words
The glass composition of claim 1 wherein ZnO and NiO are substantially absent.
Claim 11
Dependent Claim
40 words
A ferrimagnetic glass-ceramic article comprising a substantially uniform dispersion of a ferrimagnetic crystalline phase of the spinel structure in a residual glassy matrix, said article having been formed by the in-situ thermal crystallization of the glass composition of claim 9.
Claim 12
Dependent Claim
79 words
A ferrimagnetic glass-ceramic article comprising a substantially uniform dispersion of a ferrimagnetic crystalline phase of the spinel structure defined by the formula ZnO 1 -x MO x Fe 2 O 3 , wherein x is a whole or fractional number ranging from 0.1 to 1 inclusively; or MgO 0 .5 MnO 0 .5 Fe 2 O 3 in a residual glassy matrix, said article having been formed by the in-situ thermal crystallization of the glass composition of claim 1.
Claim 13
Dependent Claim
95 words
The method for forming a ferrimagnetic glass-ceramic article comprising forming said article from the composition of claim 1 and heat treating said article for a time ranging from 15 minutes to 100 hours at a temperature ranging from 500° C to 1200° C to in situ crystallize a ferrimagnetic crystalline phase of the spinel structure defined by the formula ZnO 1 -x MO x Fe 2 O 3 , wherein x is a whole or fractional number ranging from 0.1 to 1 inclusively; or MgO 0 .5 MnO 0 .5 Fe 2 O 3 .
Claim 14
Dependent Claim
15 words
The method of claim 12 wherein said glass composition is the composition of claim 2.
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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |