Patent US6593295B2 successfully refreshed from Google Patents.
EP0309750A2
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Aluminum phosphate cement compositions and lamp assemblies containing same
Assignee: General Electric Co
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Filing: 1988-08-30
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Granted: —
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Expires: 2008-08-30
Abstract
Abstract This invention relates to aluminum phosphate refractory cement compositions which comprise a mixture of aluminum phosphate containing excess phosphoric acid, relatively small particle size alumina and a mixture of relatively medium and coarse particle size inert filler materials. This cement (14) is useful for cementing tungsten-halogen lamps (10) into glass reflectors (12). The aluminum phosphate is formed with an excess of phosphoric acid which reacts with the alumina when the cement is baked at elevated temperatures.
Inventors
- 👤 Catherine Mers
- 👤 Clark David Nelson
- 👤 Vito Joseph Arsena
- 👤 Mary Schuster Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 12:12
CPC Classifications
H; H01; H01J; H01J17/00; C; C04; C04B; C04B28/00; C04B28/34; C04B28/346; C04B12/00; C04B12/02; C04B12/022; C04B22/00; C04B22/08; C04B22/16; C04B28/02; C04B28/06; F; F21; F21V; F21V19/00; H01J5/00; H01J5/50; H01J5/54; H01J5/58
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
38 words
An aluminum phosphate cement composition comprising a mixture of (i) aluminum phosphate containing excess phosphoric acid, (ii) relatively small particle size alumina particles and (iii) a mixture of relatively medium and coarse particle size inert refractory filler material.
Claim 2
Dependent Claim
38 words
An aluminum phosphate cement composition comprising a mixture of (i) aluminum phosphate containing excess phosphoric acid, (ii) relatively small particle size alumina particles and (iii) a mixture of relatively medium and coarse particle size inert refractory filler material.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein the mole ratio of phosphate to aluminum in said aluminum phosphate is greater than 3.
Claim 4
Dependent Claim
53 words
The composition of claim 2 comprising on a parts by volume basis (i) 4-15 parts of alumina, (ii) 5-30 parts of medium size filler, (iii) 40-75 parts of coarse size filler, and (iv) 10-25 parts of said aluminum phosphate taken as the total reaction product of reacting aluminum hydroxide with 85% phosphoric acid.
Claim 5
Dependent Claim
50 words
The composition of claim 3 comprising (i) alumina having a mean particle size ranging between about 1-4 microns, (ii) medium size filler particles having a mean particle size ranging between about 7-15 microns and (iii) coarse particle size filler particles having a mean particle size ranging between about 16-46 microns.
Claim 6
Dependent Claim
120 words
An aluminum phosphate cement composition comprising a mixture of (i) aluminum phosphate, (ii) relatively small particle size alumina and (iii) a mixture of relatively medium and coarse particle size inert, refractory filler material, wherein said cement is prepared by mixing an aqueous aluminum phosphate solution with an aggregate mixture of said alumina and said inert filler material to form a slurry or paste, followed by heating said so-formed slurry or paste at a temperature of at least about 250°C for a time sufficient to form said cement and wherein said paste or slurry contains excess phosphoric acid in an amount sufficient to insure that the mole ratio of phosphate to the aluminum of the aluminum phosphate is greater than 3.
Claim 7
Dependent Claim
120 words
An aluminum phosphate cement composition comprising a mixture of (i) aluminum phosphate, (ii) relatively small particle size alumina and (iii) a mixture of relatively medium and coarse particle size inert, refractory filler material, wherein said cement is prepared by mixing an aqueous aluminum phosphate solution with an aggregate mixture of said alumina and said inert filler material to form a slurry or paste, followed by heating said so-formed slurry or paste at a temperature of at least about 250°C for a time sufficient to form said cement and wherein said paste or slurry contains excess phosphoric acid in an amount sufficient to insure that the mole ratio of phosphate to the aluminum of the aluminum phosphate is greater than 3.
Claim 8
Dependent Claim
75 words
The composition of claim 5 wherein the amounts of the various ingredients present in said slurry on a parts by volume basis range from about 10-25 parts of aluminum phosphate solution, from about 4-15 parts of alumina, from about 5-30 parts of medium size filler and from about 40-75 parts of coarse size filler, wherein said aluminum phosphate solution is based on the reaction product of aluminum hydroxide with an 85% aqueous solution of H₃PO₄.
Claim 9
Dependent Claim
13 words
The composition of claim 6 additionally containing from about 15-75 parts of water.
Claim 10
Dependent Claim
50 words
The composition of claim 7 comprising (i) alumina having a mean particle size ranging between about 1-4 microns, (ii) medium size filler particles having a mean particle size ranging between about 7-15 microns and (iii) coarse particle size filler particles having a mean particle size ranging between about 16-46 microns.
Claim 11
Dependent Claim
87 words
A reflector and lamp combination comprising (a) a glass reflector member having a front reflecting portion terminating in an elongated hollow cavity portion which protrudes rearwardly from said reflector member and (b) a tungsten-halogen lamp permanently secured in said hollow cavity portion with a cement wherein said cement comprising an aluminum phosphate cement comprising a mixture of (i) aluminum phosphate containing excess phosphoric acid, (ii) a relatively small particle size alumina particles and (iii) a mixture of relatively medium and coarse particle size inert refractory filler material.
Claim 12
Dependent Claim
87 words
A reflector and lamp combination comprising (a) a glass reflector member having a front reflecting portion terminating in an elongated hollow cavity portion which protrudes rearwardly from said reflector member and (b) a tungsten-halogen lamp permanently secured in said hollow cavity portion with a cement wherein said cement comprising an aluminum phosphate cement comprising a mixture of (i) aluminum phosphate containing excess phosphoric acid, (ii) a relatively small particle size alumina particles and (iii) a mixture of relatively medium and coarse particle size inert refractory filler material.
Claim 13
Dependent Claim
21 words
The combination of claim 1 wherein the mole ratio of phosphate to aluminum in said aluminum phosphate is greater than 3.
Claim 14
Dependent Claim
53 words
The combination of claim 10 comprising on a parts by volume bases (i) 4-15 parts of alumina, (ii) 5-30 parts of medium size filler, (iii) 40-75 parts of coarse size filler, and (iv) 10-25 parts of said aluminum phosphate taken as the total reaction product of reacting aluminum hydroxide with 85% phosphoric acid.
Claim 15
Dependent Claim
50 words
The combination of claim 11 comprising (i) alumina having a mean particle size ranging between about 1-4 microns, (ii) medium size filler particles having a mean particle size ranging between about 7-15 microns and (iii) coarse particle size filler particles having a mean particle size ranging between about 16-46 microns.
Claim 16
Dependent Claim
122 words
An aluminum phosphate cement composition consisting essentially of a mixture of (i) aluminum phosphate, (ii) relatively small particle size alumina and (iii) a mixture of relatively medium and coarse particle size inert, refractory filler material, wherein said cement is prepared by mixing an aqueous aluminum phosphate solution with an aggregate mixture of said alumina and said inert filler material to form a slurry or paste, followed by heating said so-formed slurry or paste at a temperature of at least about 250°C for a time sufficient to form said cement and wherein said paste or slurry contains excess phosphoric acid in an amount sufficient to insure that the mole ratio of phosphate to the aluminum of the aluminum phosphate is greater than 3.
Claim 17
Dependent Claim
122 words
An aluminum phosphate cement composition consisting essentially of a mixture of (i) aluminum phosphate, (ii) relatively small particle size alumina and (iii) a mixture of relatively medium and coarse particle size inert, refractory filler material, wherein said cement is prepared by mixing an aqueous aluminum phosphate solution with an aggregate mixture of said alumina and said inert filler material to form a slurry or paste, followed by heating said so-formed slurry or paste at a temperature of at least about 250°C for a time sufficient to form said cement and wherein said paste or slurry contains excess phosphoric acid in an amount sufficient to insure that the mole ratio of phosphate to the aluminum of the aluminum phosphate is greater than 3.
Claim 18
Dependent Claim
75 words
The composition of claim 13 wherein the amounts of the various ingredients present in said slurry on a parts by volume basis range from about 10-25 parts of aluminum phosphate solution, from about 4-15 parts of alumina, from about 5-30 parts of medium size filler and from about 40-75 parts of coarse size filler, wherein said aluminum phosphate solution is based on the reaction product of aluminum hydroxide with an 85% aqueous solution of H₃PO₄.
Claim 19
Dependent Claim
13 words
The composition of claim 14 additionally containing from about 15-75 parts of water.
Claim 20
Dependent Claim
50 words
The composition of claim 15 comprising (i) alumina having a mean particle size ranging between about 1-4 microns, (ii) medium size filler particles having a mean particle size ranging between about 7-15 microns and (iii) coarse particle size filler particles having a mean particle size ranging between about 16-46 microns.
References Cited (Backward Citations)
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