US5266087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic abrasive stones and method for making same
Assignee: Individual
•
Filing: 1992-05-27
•
Granted: 1993-11-30
•
Expires: 2012-05-27
Abstract
Abstract Synthetic abrasive stones and method for making same. A mixture of glass and 10-20% by weight foaming agent is provided. The mixture is heated to a temperature of from 788° to 899° C., and is then cooled to room temperature.
Inventors
- 👤 Henry C. Oat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:48
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
44 words
A method of making synthetic abrasive stones, said method including the steps of: providing a mixture of glass and 10-20% by weight foaming agent; heating said mixture to a temperature of from 788° to 899° C.; and cooling said heated mixture to room temperature.
Claim 2
Independent Claim
44 words
A method of making synthetic abrasive stones, said method including the steps of: providing a mixture of glass and 10-20% by weight foaming agent; heating said mixture to a temperature of from 788° to 899° C.; and cooling said heated mixture to room temperature.
Claim 3
Dependent Claim
21 words
A method according to claim 1, which includes the step of providing ground glass, in a powder state, for said mixture.
Claim 4
Dependent Claim
56 words
A method according to claim 1, wherein said glass is selected from the group consisting of waste glass, soda lime glass, borosilicate glass, aluminosilicate glass, and mixtures thereof, and said foaming agent is selected from the group consisting of carbonates and sulfates of the alkali and alkaline earth metals, carbon black, sulfur, dolomite, and mixtures thereof.
Claim 5
Dependent Claim
40 words
A method according to claim 3, wherein said foaming agent is selected from the group consisting of calcium carbonate, potassium carbonate, sodium carbonate, barium carbonate, strontium carbonate, calcium sulfate, potassium sulfate, sodium sulfate, barium sulfate, strontium sulfate, and mixtures thereof.
Claim 6
Dependent Claim
21 words
A method according to claim 4, wherein said foaming agent is calcium carbonate and said mixture contains 15% by weight thereof.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein said heating step includes holding said mixture at said heated temperature for 5 to 30 minutes.
Claim 8
Dependent Claim
41 words
A method according to claim 6, wherein said foaming agent is calcium carbonate, and said heating step includes heating said calcium carbonate to a temperature of from 800° to 860° C., and holding said mixture at said temperature for 20 minutes.
Claim 9
Dependent Claim
32 words
A method according to claim 1, wherein said cooling step includes first rapid cooling said heated mixture to a temperature of 538° C. and then slow cooling said mixture to room temperature.
Claim 10
Dependent Claim
23 words
A method according to claim 1, which includes the step of adding binder and moisture to said mixture prior to said heating step.
Claim 11
Dependent Claim
22 words
A method according to claim 1, which includes the step of molding said mixture into a shape prior to said heating step.
Claim 12
Dependent Claim
22 words
A method according to claim 1, which includes the step of adding said mixture to a mold prior to said heating step.
Claim 13
Dependent Claim
22 words
A method according to claim 1, in which said mixture further contains pumice sludge as approximately 25% by weight of said mixture.
Claim 14
Dependent Claim
9 words
The product made by the process of claim 1.
Claim 15
Dependent Claim
35 words
A synthetic abrasive stone produced by heating at a temperature of from 788° to 899° C. a mixture comprising: a foamed glass product derived from a mixture of glass and 13-20% by weight foaming agent.
Claim 16
Dependent Claim
35 words
A synthetic abrasive stone produced by heating at a temperature of from 788° to 899° C. a mixture comprising: a foamed glass product derived from a mixture of glass and 13-20% by weight foaming agent.
Claim 17
Dependent Claim
54 words
A synthetic abrasive stone according to claim 14, wherein said glass is selected from the group consisting of waste glass, soda lime glass, borosilicate glass and aluminosilicate glass, and said foaming agent is selected from the group consisting of carbonates and sulfates of the alkali and alkaline earth metals, carbon black, sulfur and dolomite.
Claim 18
Dependent Claim
18 words
A synthetic abrasive stone according to claim 15, wherein said foaming agent is 15% by weight calcium carbonate.
Claim 19
Dependent Claim
13 words
A method according to claim 4, wherein said foaming agent is calcium carbonate.
Claim 20
Dependent Claim
15 words
A synthetic abrasive stone according to claim 15, wherein said foaming agent is calcium carbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |