Patent US5454752A successfully refreshed from Google Patents.
US5454752A
Expired / Lapsed
US
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Abrasive device
Assignee: Individual
•
Filing: 1993-11-15
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Granted: 1995-10-03
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Expires: 2013-11-15
Abstract
Abstract The abrasive polishing device has a carrier, typically in the form of a rotatable polishing head (10) and abrasive polishing pads (16) mounted on the carrier. Each polishing pad (16) includes an abrasive body (18) which is provided by a thermoplastic polymer impregnated with ultrahard abrasive particles and which presents an abrasive polishing surface for performing an abrasive polishing action in use. The abrasive body (18) is formed with a regular array of recesses, typically narrow capillarytype passages therein which extend to the abrasive surface. The recesses result in improved cooling of the abrasive layer during a polishing operation.
Inventors
- 👤 John S. Sexton
- 👤 Derek N. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:07
CPC Classifications
B; B24; B24D; B24D7/00; B24D7/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
75 words
An abrasive polishing device comprising a carrier and a plurality of level abrasive polishing pads mounted on the carrier in spaced relationship thereon, each pad including an abrasive body which is provided by a thermoplastic polymer impregnated therethrough with ultra-hard abrasive particles and which presents an abrasive polishing surface for performing an abrasive polishing action in use, the abrasive body being formed with a regular array of recesses therein which extend to the abrasive surface.
Claim 2
Dependent Claim
75 words
An abrasive polishing device comprising a carrier and a plurality of level abrasive polishing pads mounted on the carrier in spaced relationship thereon, each pad including an abrasive body which is provided by a thermoplastic polymer impregnated therethrough with ultra-hard abrasive particles and which presents an abrasive polishing surface for performing an abrasive polishing action in use, the abrasive body being formed with a regular array of recesses therein which extend to the abrasive surface.
Claim 3
Dependent Claim
19 words
An abrasive polishing apparatus according to claim 1 wherein the ultra-hard material comprises diamond or cubic boron nitride particles.
Claim 4
Dependent Claim
23 words
An abrasive polishing apparatus according to claim 2 wherein the thermoplastic polymer is selected from PEEK, poly(amide-imide), polyphenylene sulphide and liquid crystal polymer.
Claim 5
Dependent Claim
26 words
An abrasive polishing apparatus according to claim 3 wherein the ultrahard particles are diamond particles with a size in the range 2 micron to 300 micron.
Claim 6
Dependent Claim
27 words
An abrasive polishing apparatus according to claim 4 wherein the diamond particles are present in the abrasive body in an amount of 3% to 30% by volume.
Claim 7
Dependent Claim
27 words
An abrasive polishing apparatus according to claim 5 wherein the diamond particles are present in the abrasive body in an amount of 3% to 10% by volume.
Claim 8
Dependent Claim
24 words
An abrasive polishing apparatus according to claim 1 wherein the recesses are in the form of narrow passages extending perpendicularly to the polishing surface.
Claim 9
Dependent Claim
23 words
An abrasive polishing apparatus according to claim 7 wherein the passages are round cross-section capillary passages with a diameter of approximately 50 micron.
Claim 10
Dependent Claim
24 words
An abrasive polishing apparatus according to claim 8 wherein the abrasive body is in the form of an abrasive layer mounted on a base.
Claim 11
Dependent Claim
17 words
An abrasive polishing apparatus according to claim 9 wherein the base is made of a thermoplastic polymer.
Claim 12
Dependent Claim
27 words
An abrasive polishing apparatus according to claim 10 wherein the layer and the base have complemental, interengaged projections and recesses that secure the layer to the base.
Claim 13
Dependent Claim
32 words
An abrasive polishing apparatus according to claim 9 wherein either or both of the abrasive body and the base incorporate a colourant which identifies the abrasive capacity of the ultra-hard abrasive particles.
Claim 14
Dependent Claim
63 words
A polishing pad which is adapted to be mounted on a rotatable polishing head and which comprises an abrasive layer which is provided by a thermoplastic polymer impregnated therethrough with ultra-hard particles, and a base on which the abrasive layer is mounted, the abrasive layer presenting a polishing surface and including a regular array of recesses therein which extend to the polishing surface.
Claim 15
Dependent Claim
63 words
A polishing pad which is adapted to be mounted on a rotatable polishing head and which comprises an abrasive layer which is provided by a thermoplastic polymer impregnated therethrough with ultra-hard particles, and a base on which the abrasive layer is mounted, the abrasive layer presenting a polishing surface and including a regular array of recesses therein which extend to the polishing surface.
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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) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |