US4751797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive sheet and method of preparation
Assignee: Nihon Micro Coating Co Ltd
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Filing: 1986-09-26
•
Granted: 1988-06-21
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Expires: 2006-09-26
Abstract
Abstract An abrasive sheet or polishing sheet containing an abrasive layer divided into discrete blocks by a network of grooves. The polishing sheet is prepared by making a slurry of abrasive particles and a resin adhesive agent of low density and viscosity, spreading it on a base and heating the resulting sheet from below the base.
Inventors
- 👤 Akira Fujimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:46
CPC Classifications
B; B24; B24B; B24B11/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
49 words
A method for preparing an abrasive sheet comprising (a) preparing a slurry of abrasive particles and a resin adhesive agent of low viscosity and density; (b) spreading the slurry on a base; (c) heating the resulting sheet from below the base the abrasive sheet comprising a Benard cell pattern.
Claim 2
Independent Claim
49 words
A method for preparing an abrasive sheet comprising (a) preparing a slurry of abrasive particles and a resin adhesive agent of low viscosity and density; (b) spreading the slurry on a base; (c) heating the resulting sheet from below the base the abrasive sheet comprising a Benard cell pattern.
Claim 3
Dependent Claim
13 words
A method as in claim 1 wherein said low viscosity comprises 60-90 cp.
Claim 4
Dependent Claim
14 words
A method as in claim 1 wherein said low density comprises 1.1-1.3 g/cubic cm.
Claim 5
Dependent Claim
14 words
A method as in claim 1 wherein said base is 16-100 microns in thickness.
Claim 6
Dependent Claim
13 words
A method as in claim 1 wherein said base comprises a plastic sheet.
Claim 7
Dependent Claim
16 words
A method as in claim 1 wherein said heating occurs at a temperature of 90°-140° C.
Claim 8
Dependent Claim
11 words
A method as in claim 5 wherein said plastic comprises polyester.
Claim 9
Dependent Claim
17 words
A method as in claim 1 wherein said abrasive particles have a particle diameter of 0.3-1 microns.
Claim 10
Dependent Claim
23 words
A method as in claim 8 wherein said abrasive particles comprise Cr 2 O 3 and Al 2 O 3 as abrasive particles.
Claim 11
Dependent Claim
23 words
The method, as in claim 1 wherein the low viscosity comprises 60-90 cp, the low density comprises 1.1-1.3 glcubic temperature of 90°-140° C.
Claim 12
Dependent Claim
31 words
A polishing sheet comprising a base, and an abrasive material polishing layer on said base sheet, said polishing layer being divided into discrete Benard cell blocks by a network of grooves.
Claim 13
Dependent Claim
31 words
A polishing sheet comprising a base, and an abrasive material polishing layer on said base sheet, said polishing layer being divided into discrete Benard cell blocks by a network of grooves.
Claim 14
Dependent Claim
18 words
A polishing sheet, as in claim 11 wherein the Benard cell pattern is uniformly distributed throughout the sheet.
Claim 15
Dependent Claim
14 words
A polishing sheet as in claim 11 wherein the base is a plastic sheet.
Claim 16
Dependent Claim
18 words
A polishing sheet, as in claim 11 wherein the abrasive particles have a particle diameter of 0.3-1 microns.
Claim 17
Dependent Claim
28 words
A polishing sheet, as in claim 11 wherein the abrasive particles are selected from the group consisting of Cr 2 O 3 and Al 2 O 3 .
Claim 18
Dependent Claim
14 words
A polishing sheet, as in claim 11 wherein the base is 16-100 microns thick.
Claim 19
Dependent Claim
17 words
The polishing sheet, as in claim 11, wherein said Benard cell pattern is a hexagonal cell pattern.
Claim 20
Dependent Claim
14 words
The polishing sheet, as in claim 12 wherein the base is a plastic sheet.
Claim 21
Dependent Claim
28 words
The polishing sheet, as in claim 12 wherein the abrasive particles are selected from the group consisting of Cr 2 O 3 and Al 2 O 3 .
Claim 22
Dependent Claim
46 words
A polishing sheet, prepared by (a) preparing a slurry of abrasive particles and a resin adhesive agent of low viscosity and density; (b) spreading the slurry on a base; (c) heating the resulting sheet from below the base the abrasive sheet comprising a Benard cell pattern.
Claim 23
Dependent Claim
46 words
A polishing sheet, prepared by (a) preparing a slurry of abrasive particles and a resin adhesive agent of low viscosity and density; (b) spreading the slurry on a base; (c) heating the resulting sheet from below the base the abrasive sheet comprising a Benard cell pattern.
Claim 24
Dependent Claim
14 words
A polishing sheet as in claim 20 wherein said low viscosity comprises 60-90 cp.
Claim 25
Dependent Claim
15 words
A polishing sheet as in claim 20 wherein said low density comprises 1.1-1.3 g/cubic cm.
Claim 26
Dependent Claim
15 words
A polishing sheet as in claim 20 wherein said base is 16-100 microns in thickness.
Claim 27
Dependent Claim
17 words
A polishing sheet as in claim 20 wherein said heating occurs at a temperature of 90°-140° C.
Claim 28
Dependent Claim
18 words
A polishing sheet as in claim 20 wherein said abrasive particles have a particle diameter of 0.3-1 microns.
Claim 29
Dependent Claim
39 words
A polishing sheet comprising a base and a polishing layer, the base being coated on at least one side with a layer of abrasive particles mixed into a slurry with a resin adhesive agent and formed into Benard cells.
Claim 30
Dependent Claim
39 words
A polishing sheet comprising a base and a polishing layer, the base being coated on at least one side with a layer of abrasive particles mixed into a slurry with a resin adhesive agent and formed into Benard cells.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |