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US3792553A Expired / Lapsed US ⏱️ 0.0 years remaining

Abrasive powder of fused alumina containing vanadium tetroxide

Assignee: Wallace Murray Corp
•
Filing: 1971-09-28
•
Granted: 1974-02-19
•
Expires: 1991-09-28
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Abstract

Abstract Excellent abrasive materials are provided by incorporating between about 0.1 and 7.5 percent, preferably 0.25 and 5.0 percent, and optimally about 1.5 percent by weight of vanadium tetroxide into a material high in alumina content, such as bauxite, corundum and relatively pure alumina. The vanadium tetroxide is fused per se in the alumina-containing material under non-reducing conditions or, preferably introduced as vanadium pentoxide with a stoichiometric amount of a reducing agent, such as aluminum metal, carbon, etc., to reduce the vanadium pentoxide to vanadium tetroxide. The fusion of the vanadium tetroxide in the alumina is accomplished in an electric furnace whereby the electric current is conducted through a layer of molten alumina at the bottom of the furnace with the liquid layer being covered with a substantial layer of a mixture of powdered solid alumina and the vanadium tetroxide-providing source.

Inventors

  • 👤 R Schleifer
  • 👤 J Price
  • 👤 H Bowden

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 08:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C04B35/01; C04B35/10; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 24 words
An abrasive powder material in accordance with claim 1 wherein the amount of vanadium tetroxide is between about 0.25 and 5.0 percent by weight.
Claim 2
Dependent Claim 20 words
An abrasive material in accordance with claim 1 wherein the amount of vanadium tetroxide is about 1.5 percent by weight.
Claim 3
Dependent Claim 30 words
An abrasive article of bonded abrasive grains, said grains being consisting essentially of fused alumina containing between about 0.1 and 7.5 percent by weight of vanadium tetroxide in solid solution.
Claim 4
Dependent Claim 23 words
An abrasive article in accordance with claim 4 wherein the amount of vanadium tetroxide is between about 0.25 and 5.0 percent by weight.
Claim 5
Dependent Claim 20 words
An abrasive article in accordance with claim 4 wherein the amount of vanadium tetroxide is about 1.5 percent by weight.
Claim 6
Dependent Claim 28 words
A grinding wheel of bonded abrasive grains, said grains consisting essentially of alumina containing between about 0.1 and 7.5 percent by weight of vanadium tetroxide in solid solution.
Claim 7
Dependent Claim 23 words
A grinding wheel in accordance with claim 7 wherein the amount of vanadium tetroxide is between about 0.25 and 5.0 percent by weight.
Claim 8
Dependent Claim 20 words
A grinding wheel in accordance with claim 7 wherein the amount of vanadium tetroxide is about 1.5 percent by weight.
Claim 9
Dependent Claim 85 words
A process for producing an abrasive material comprising fusing a mixture of alumina and between about 0.1 and 7.5 percent by weight of vanadium pentoxide and a stoichiometric quantity of a reducing agent to reduce substantially all of the vanadian pentoxide to vanadium tetroxide, providing a cover layer of unmolten mixture of alumina and vanadium pentoxide over the fused mixture substantially throughout the fusion process, cooling the resulting fused mixture of alumina and vanadium tetroxide to a solid, and crushing to particles of desired size.
Claim 10
Dependent Claim 22 words
A process according to claim 10 wherein the reducing agent is a member of the class consisting of aluminum metal and carbon.
Claim 11
Dependent Claim 58 words
A process for producing an abrasive material comprising fusing under non-reducing conditions a mixture of alumina and between about 0.1 and 7.5 percent by weight of vanadium tetroxide, providing a cover layer of unmolten mixture over the fused mixture sUbstantially throughout the fusion process, cooling the fused mixture to a solid, and crushing to particles of desired size.

References Cited (Backward Citations)

US2360841A Cited
US2369709A Cited
US2418496A Cited
US2961296A Cited
US3615307A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-18 1977-08-20 1978-02-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-18 1981-08-20 1982-02-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-18 1985-08-20 1986-02-19 $7700.00 Window Closed / Lapsed

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