US3923476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing coated abrasive particles
Assignee: Individual
•
Filing: 1974-01-14
•
Granted: 1975-12-02
•
Expires: 1994-01-14
Abstract
Abstract A discrete coated abrasive particle wherein the coating comprises an inner metallic, e.g. nickel, layer and an outer nonmetallic protective layer which is preferably a solid resin such as phenolformaldehyde resin is produced by depositing the protective layer on to metal coated particles and the metal coated particles are preferably washed with a cleaning solution immediately prior to the deposition.
Inventors
- 👤 Alexander Rose Roy
- 👤 Schalkwyk Johannes Daniel Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:11
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A METHOD OF PRODUCING COATED ABRASIVE PARTICLES FOR USE IN THE MANFACTURE OF A RESIN-BONDED ABRASIVE TOOL IN WHICH THE COATING COMPRISES AN INNER METALLIC LAYER AND AN OUTER SOLID RESIN PROTECTIVE LAYER, WHICH METHOD COMPRISES THE STEPS OF PROVIDING A BATCH OF PARTICLES COATED WITH A METAL SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COPPER PRESENT IN AN AMOUNT FOR 20 TO 80% BY WEIGHT OF THE COATED PARTICLE, REMOVING METAL OXIDES FROM THE EXPOSED SURFACES OF THE PARTICLES, IMMEDIATELY THEREAFTER DEPOSITIING ON THE PARTICLES, BEFORE REOXIDATION OF THE EXPOSED SURFACE THEREOF OCCURS, A PROTECTIVE LAYER OF A SOLID RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOLFORMALDEHYDE, EPOXY, POLYIMIDE, ALKYD, NONSATURATED POLYESTER AND POLYAMIDE IN AN AMOUNT FROM 1 TO 3% BY WEIGHT OF THE COATED PARTICLE, AND RECOVERING THE PARTICLES AS DISCRETE PARTICLES HAVING A METAL/PROTECTIVE LAYER COATING.
Claim 2
Independent Claim
141 words
A METHOD OF PRODUCING COATED ABRASIVE PARTICLES FOR USE IN THE MANFACTURE OF A RESIN-BONDED ABRASIVE TOOL IN WHICH THE COATING COMPRISES AN INNER METALLIC LAYER AND AN OUTER SOLID RESIN PROTECTIVE LAYER, WHICH METHOD COMPRISES THE STEPS OF PROVIDING A BATCH OF PARTICLES COATED WITH A METAL SELECTED FROM THE GROUP CONSISTING OF NICKEL AND COPPER PRESENT IN AN AMOUNT FOR 20 TO 80% BY WEIGHT OF THE COATED PARTICLE, REMOVING METAL OXIDES FROM THE EXPOSED SURFACES OF THE PARTICLES, IMMEDIATELY THEREAFTER DEPOSITIING ON THE PARTICLES, BEFORE REOXIDATION OF THE EXPOSED SURFACE THEREOF OCCURS, A PROTECTIVE LAYER OF A SOLID RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOLFORMALDEHYDE, EPOXY, POLYIMIDE, ALKYD, NONSATURATED POLYESTER AND POLYAMIDE IN AN AMOUNT FROM 1 TO 3% BY WEIGHT OF THE COATED PARTICLE, AND RECOVERING THE PARTICLES AS DISCRETE PARTICLES HAVING A METAL/PROTECTIVE LAYER COATING.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein the removal of metal oxides is effected by washing the metal-coated particles with a cleaning solution.
Claim 4
Dependent Claim
15 words
A method according to claim 2, wherein the cleaning solution is an alkaline cleaning solution.
Claim 5
Dependent Claim
20 words
A method according to claim 2, wherein the cleaning solution is a 10 to 30% by weight sodium carbonate solution.
Claim 6
Dependent Claim
18 words
A method according to claim 2 wherein the temperature of the cleaning solution is adjacent its boiling point.
Claim 7
Dependent Claim
26 words
A method according to claim 2, and removing the cleaning solution from the particles and drying the particles prior to deposition thereon of said protective layer.
Claim 8
Dependent Claim
21 words
A method according to claim 6, wherein said cleaning solution removal and drying are effected by contacting the particles with acetone.
Claim 9
Dependent Claim
27 words
A method according to claim 1, wherein the deposition of the protective layer is effected by immersing the particles in a solution of said resin in tetrahydrofuran.
References Cited (Backward Citations)
US3528788A
Cited
US3518068A
Cited
US3650714A
Cited
US3585013A
Cited
US3650715A
Cited
US3661544A
Cited
US3645706A
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |