Patent US4112631A successfully refreshed from Google Patents.
US4112631A
Expired / Lapsed
US
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Encapsulated abrasive grains and articles made therefrom
Assignee: 3M Co
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Filing: 1973-05-29
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Granted: 1978-09-12
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Expires: 1993-05-29
Abstract
Abstract A capsule containing fine abrasive grains dispersed in a liquid or low melting solid grinding aid can be substituted for conventional abrasive polishing grains. A novel coated abrasive structure is made by bonding such capsules to a backing sheet.
Inventors
- 👤 Robert N. Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:59
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1472; C09K3/1436
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A coated abrasive product in which a layer of capsules is bonded to a flexible sheet backing by a cured binder, said capsules being spheroidal and containing a plurality of abrasive grains dispersed in a lubricant, the abrasive grains having a nominal diameter of from about 0.5 to 25 microns and constituting about 5-30% by volume of capsule content, the diameter of said capsules being in the range of about 10-200 microns and at least about twice the nominal diameter of said abrasive grains, the capsule walls consisting of gelatin or resinous materials formed by interfacial encapsulation.
Claim 2
Dependent Claim
97 words
A coated abrasive product in which a layer of capsules is bonded to a flexible sheet backing by a cured binder, said capsules being spheroidal and containing a plurality of abrasive grains dispersed in a lubricant, the abrasive grains having a nominal diameter of from about 0.5 to 25 microns and constituting about 5-30% by volume of capsule content, the diameter of said capsules being in the range of about 10-200 microns and at least about twice the nominal diameter of said abrasive grains, the capsule walls consisting of gelatin or resinous materials formed by interfacial encapsulation.
Claim 3
Dependent Claim
115 words
In a coated abrasive article comprising abrasive grains bonded to a supporting substrate by a resin, the improvement which comprises: using as the sole source of abrasive grains, spheroidal capsules each containing a plurality of abrasive mineral particles dispersed in a lubricant, the abrasive mineral particles having a nominal diameter of from about 0.5 to about 25 microns, the diameter of said capsules being in the range of about 10 to 200 microns and at least about twice the nominal diameter of said abrasive mineral particles, whereby a coated abrasive is formed which provides a polish similar to that achieved with a loose abrasive grain while affording the handling properties of a coated abrasive article.
Claim 4
Dependent Claim
115 words
In a coated abrasive article comprising abrasive grains bonded to a supporting substrate by a resin, the improvement which comprises: using as the sole source of abrasive grains, spheroidal capsules each containing a plurality of abrasive mineral particles dispersed in a lubricant, the abrasive mineral particles having a nominal diameter of from about 0.5 to about 25 microns, the diameter of said capsules being in the range of about 10 to 200 microns and at least about twice the nominal diameter of said abrasive mineral particles, whereby a coated abrasive is formed which provides a polish similar to that achieved with a loose abrasive grain while affording the handling properties of a coated abrasive article.
Claim 5
Dependent Claim
12 words
The coated abrasive of claim 2, wherein the abrasive mineral is diamond.
Claim 6
Dependent Claim
11 words
The coated abrasive of claim 2, wherein the lubricant is wax.
Claim 7
Dependent Claim
12 words
The coated abrasive of claim 2, wherein the lubricant is a liquid.
Claim 8
Dependent Claim
13 words
The coated abrasive of claim 2 wherein the abrasive material is aluminum oxide.
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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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |