US4316963A
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Leadless glaze composition made with alkaline earth molybdenate
Assignee: O HOMMEL Co A CORP OF PA
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Filing: 1981-02-06
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Granted: 1982-02-23
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Expires: 2001-02-06
Abstract
Abstract A leadless glaze composition having properties that make lead oxide containing glazes so widely used as ceramic glazes. The glazes according to this invention are prepared to analyze more than about 0.53 to about 1.5 weight percent molybdenum trioxide with the source of the molybdenum trioxide either in the frit or as a mill addition being alkaline earth molybdenate, for example, calcium molybdenate (CaMoO4).
Inventors
- 👤 Richard O. Hommel
- 👤 David Klimas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:51
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A method of preparing a leadless glaze composition comprising the steps of: a. batching a raw glaze composition including sources of silica, boric acid, alumina, alkaline earth oxides, alkali metal oxides, and alkaline earth molybdenate as the source of MoO 3 in the batch, b. fritting the batch, and c. milling the fritted batch.
Claim 2
Independent Claim
54 words
A method of preparing a leadless glaze composition comprising the steps of: a. batching a raw glaze composition including sources of silica, boric acid, alumina, alkaline earth oxides, alkali metal oxides, and alkaline earth molybdenate as the source of MoO 3 in the batch, b. fritting the batch, and c. milling the fritted batch.
Claim 3
Dependent Claim
14 words
The method according to claim 1 wherein the alkaline earth molybdenate is calcium molybdenate.
Claim 4
Dependent Claim
44 words
The method according to claim 1 wherein the fritted batch analyzes by weight percent: ______________________________________
LiO.sub.2 0-3.5
Na.sub.2 O 0-9
K.sub.2 O 0-9
CaO 3-11
BaO 0-25
SrO 0-25
ZnO 0-14
MgO 0-6
Al.sub.2 O.sub.3
3-13
B.sub.2 O.sub.3
5-18
SiO.sub.2 40-60
MoO.sub.3 0.53-1.5
______________________________________
Claim 5
Dependent Claim
60 words
A leadless glaze frit composition analyzing silica, alumina, boric acid, alkaline earth oxides, alkali oxides and more than about 0.53 and up to about 1.5 percent by weight MoO 3 prepared from a raw batch in which the MoO 3 is supplied as an alkaline earth molybdenate such that the glaze frit has properties similar to lead containing glaze frits.
Claim 6
Dependent Claim
60 words
A leadless glaze frit composition analyzing silica, alumina, boric acid, alkaline earth oxides, alkali oxides and more than about 0.53 and up to about 1.5 percent by weight MoO 3 prepared from a raw batch in which the MoO 3 is supplied as an alkaline earth molybdenate such that the glaze frit has properties similar to lead containing glaze frits.
Claim 7
Dependent Claim
52 words
A glaze frit composition analyzing by weight percent: ______________________________________
LiO.sub.2 0-3.5
Na.sub.2 O 0-9
K.sub.2 O 0-9
CaO 3-11
BaO 0-25
SrO 0-25
ZnO 0-14
MgO 0-6
Al.sub.2 O.sub.3
3-13
B.sub.2 O.sub.3
5-18
SiO.sub.2 40-60
MoO.sub.3 0.53-1.50
______________________________________ in which the MoO 3 is supplied to the frit batch as calcium molybdenate.
Claim 8
Dependent Claim
52 words
A glaze frit composition analyzing by weight percent: ______________________________________
LiO.sub.2 0-3.5
Na.sub.2 O 0-9
K.sub.2 O 0-9
CaO 3-11
BaO 0-25
SrO 0-25
ZnO 0-14
MgO 0-6
Al.sub.2 O.sub.3
3-13
B.sub.2 O.sub.3
5-18
SiO.sub.2 40-60
MoO.sub.3 0.53-1.50
______________________________________ in which the MoO 3 is supplied to the frit batch as calcium molybdenate.
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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |