US4734104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated abrasive product incorporating selective mineral substitution
Assignee: 3M Co
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Filing: 1986-04-14
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Granted: 1988-03-29
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Expires: 2006-04-14
Abstract
Abstract Replacement of all or most of the coarse mineral in a coated abrasive product by a superior (and typically more expensive) mineral improves abrading performance significantly more than would be predicted. In some cases the performance is superior to that of products made with either mineral alone. Typically 5% to 30% of the total mineral weight is made up of the superior mineral.
Inventors
- 👤 David E. Broberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
B; B24; B24D; B24D3/00; B24D11/00; B24D11/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
140 words
A coated abrasive product having a specified nominal grade of abrasive granules firmly adherently bonded to a sheet backing, the particle size of said granules ranging from fine to coarse, said granules consisting essentially of at least two types of mineral, one of said types being present as a minor portion and demonstrably superior to an equivalent grade of the other (inferior) type in the abrading operation for which said coated abrasive product is intended to be used, most of said superior mineral being concentrated in the coarse portion, whereby said coated abrasive product significantly outperforms a coated abrasive product that is identical except that either (a) it contains only inferior mineral or (b) the same minor amount of superior mineral is distributed throughout the fine to coarse particle size range in the same proportions as is the inferior mineral.
Claim 2
Dependent Claim
140 words
A coated abrasive product having a specified nominal grade of abrasive granules firmly adherently bonded to a sheet backing, the particle size of said granules ranging from fine to coarse, said granules consisting essentially of at least two types of mineral, one of said types being present as a minor portion and demonstrably superior to an equivalent grade of the other (inferior) type in the abrading operation for which said coated abrasive product is intended to be used, most of said superior mineral being concentrated in the coarse portion, whereby said coated abrasive product significantly outperforms a coated abrasive product that is identical except that either (a) it contains only inferior mineral or (b) the same minor amount of superior mineral is distributed throughout the fine to coarse particle size range in the same proportions as is the inferior mineral.
Claim 3
Dependent Claim
23 words
The product of claim 1 wherein the superior mineral constitutes from about 5% to about 30% of the total weight of abrasive granules.
Claim 4
Dependent Claim
27 words
The product of claim 1 wherein the abrasive granules are present in at least two layers, the superior mineral being located substantially entirely in the outermost layer.
Claim 5
Dependent Claim
61 words
The coated abrasive product of claim 1 wherein the abrasive granules consist essentially of at least two types of aluminum oxide-based mineral, one of said types being present as a minor portion and demonstrably superior to an equivalent grade of the other type in the abrasion of cold rolled steel, said superior aluminum oxide-based mineral being concentrated in the coarse portion.
Claim 6
Dependent Claim
45 words
The coated abrasive product of claim 4 wherein the superior aluminum oxide-based mineral is present in both the control fraction and the overgrade fraction, the amount of superior mineral in the coated abrasive product not exceeding about 30% of the total weight of mineral present.
Claim 7
Dependent Claim
24 words
The coated abrasive product of claim 5 wherein the superior aluminum oxide-based mineral consists essentially of all the fractions of the next coarser grade.
Claim 8
Dependent Claim
22 words
The coated abrasive product of claim 5 wherein the superior mineral constitutes at least 5% of the total weight of abrasive granules.
Claim 9
Dependent Claim
25 words
The coated abrasive product of claim 7 wherein the superior mineral constitutes from about 10% to about 20% of the total weight of abrasive granules.
Claim 10
Dependent Claim
31 words
The coated abrasive product of claim 8 wherein the abrasive granules are present in at least two layers, the superior aluminum oxide-based mineral being located substantially entirely in the outermost layer.
Claim 11
Dependent Claim
27 words
The coated abrasive product of claim 4 wherein the large particles consist essentially of co-fused alumina-zirconia and the balance of the particles consist essentially of fused alumina.
Claim 12
Dependent Claim
115 words
The coated abrasive product of claim 4 wherein the large particles consist essentially of non-fused synthetic granular mineral having a microcrystalline structure comprising a secondary phase of crystallites comprising modifying component in an alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from p1 (a) at least 10% of zirconia, hafnia, or a combination of the two, (b) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, and (c) 1-45% of component (a) and at least 1% of component (b) the balance of said particles consisting essentially of fused alumina.
Claim 13
Dependent Claim
25 words
The coated abrasive product of claim 11 wherein the superior mineral constitutes from about 5% to about 30% of the total weight of abrasive granules.
Claim 14
Dependent Claim
25 words
The coated abrasive product of claim 12 wherein the superior mineral consitutes from about 10% to about 20% of the total weight of abrasive granules.
Claim 15
Dependent Claim
31 words
The coated abrasive product of claim 1 wherein the relative superiority and inferiority of the minerals is established in accordance with the test for abrading cold rolled steel set forth herein.
Claim 16
Dependent Claim
19 words
The product of claim 14 wherein the superior mineral constitutes from 1 to 50% of the total mineral present.
Claim 17
Dependent Claim
112 words
The product of claim 14 wherein the large particles consist essentially of non-fused synthetic granular material having a microcrystalline structure comprising a secondary phase of crystallites comprising modifying component in an alumina phase comprising alpha-alumina, said modifying component, on a volume percent of first solids of the mineral, being selected from (a) at least 10% of zirconia, hafniz, or a combination of the two, (b) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, and (c) 1-45% of component (a) and at least 1% of component (b), the balance of said particles consisting essentially of fused alumina.
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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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |