Patent US5111954A successfully refreshed from Google Patents.
Patent US3673746A successfully refreshed from Google Patents.
US3673746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polishing glass
Assignee: Engelhard Hanovia Inc
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Filing: 1971-02-03
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Granted: 1972-07-04
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Expires: 1991-02-03
Abstract
Abstract A glass workpiece is polished to obtain a surface having a high luster and a substantial absence of polishing defects by applying to the surface a slurry of a glass powder of substantially the same hardness and composition as the workpiece and a liquid carrier. The slurry also contains a buffering agent which stabilizes its pH between 8 and 12 and preferably between 10 and 11. Its specific gravity preferably lies between 1.14 and 1.19. A rotating polishing pad made of a synthetic fiber is then pressed against the workpiece to polish the piece.
Inventors
- 👤 Carle W Highberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:40
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/20; B24B7/22; B24B7/24; B24B7/241; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1463
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
22 words
The method of claim 1 wherein the pH of said slurry is maintained by said buffering agent between about 10 and 11.
Claim 2
Dependent Claim
17 words
The method of claim 1 wherein the glass powder is of the same composition as the workpiece.
Claim 3
Dependent Claim
54 words
The method of claim 3 wherein the glass workpiece is first subjected to a grinding process and wherein the glass removed from the workpiece during the grinding of the workpiece forms at least part of the abrasive component of the slurry whereby the need for replenishment of the abrasive from another source is diminished.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the liquid carrier is tap water.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the Particles forming the glass powder have a size range between approximately 3 and 50 microns.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein the particles forming the glass powder have a particle size range of between approximately 15 and 50 microns and the slurry includes a suspending agent.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the specific gravity of the slurry lies between approximately 1.14 and 1.19.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the workpiece is ground with a fixed abrasive wheel before the slurry is applied.
Claim 9
Dependent Claim
14 words
The method of claim 9 wherein the fixed abrasive wheel is a diamond wheel.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein the polishing pad is made of nylon.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the polishing pad is made of nylon felt.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein the workpiece is made of soda-lime glass.
Claim 13
Independent Claim
137 words
A method of polishing the surface of a diamond ground glass workpiece following the grinding of said workpiece comprising applying thereto a slurry having a specific gravity which lies between approximately 1.14 and 1.19 which comprises water, a suspending agent, an abrasive component consisting essentially of glass powder of substantially the same hardness and composition as the workpiece having an average particle size between approximately 3 and 50 microns, and a buffering agent, the pH of said slurry being maintained by said buffering agent between about 10 and 11, and applying a moving polishing pad made of nylon felt to the workpiece, the glass removed from the workpiece during the coarse grinding thereof forming at least a part of the slurry whereby the polishing operation can be carried out without continuously replenishing the abrasive from another source.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |