US3892908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating of solid substrates with magnetically propelled particles
Assignee: 3M Co
•
Filing: 1973-06-25
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Granted: 1975-07-01
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Expires: 1993-06-25
Abstract
Abstract Particulate material is coated onto a solid substrate surface by exposing the surface in a confined volume containing small magnet elements mixed with the particulate material, and establishing within an effective distance of the confined volume, a magnetic field varying in direction with time. The magnetic field is of sufficient intensity to propel the magnet elements and the particulate material at a velocity which causes the mixture to impinge upon the surface and the particulate material to adhere thereto as a layer.
Inventors
- 👤 William R Lovness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/02; C23C24/04; H; H01; H01F; H01F41/00; H01F41/14; H01F41/16; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A PROCESS FOR COATING PARTICULATE MATERIAL UPON THE SURFACE OF A SUBSTRATE COMPRISING: EXPOSING SAID SUBSTRATE SURFACE IN A CONFINED VOLUME TO A PLURALITY OF DISCONNECTED AND INDEPENDENTLY MOVABLE SMALL PERMANENT MAGNET ELEMENTS AND SAID PARTICULATE MATERIAL, AND ESTABLISHING WITIN SAID VOLUME, IN ADDITION TO THE MGNETIC FIELD OF SAID PERMANENT MAGNET ELEMENTS, A MAGNETIC FIELD VARYING IN DIRECTION WITH TIME AND OF SUFFICIENT INTENSITY TO IMPART MOVEMENT TO THE MAGNETIC ELEMENTS TO CAUSE THE PARTICULATE MATERIAL TO IMPINGE UPON AND TO COAT SAID EXPOSED SUBSTRATE SURFACE.
Claim 2
Dependent Claim
87 words
A PROCESS FOR COATING PARTICULATE MATERIAL UPON THE SURFACE OF A SUBSTRATE COMPRISING: EXPOSING SAID SUBSTRATE SURFACE IN A CONFINED VOLUME TO A PLURALITY OF DISCONNECTED AND INDEPENDENTLY MOVABLE SMALL PERMANENT MAGNET ELEMENTS AND SAID PARTICULATE MATERIAL, AND ESTABLISHING WITIN SAID VOLUME, IN ADDITION TO THE MGNETIC FIELD OF SAID PERMANENT MAGNET ELEMENTS, A MAGNETIC FIELD VARYING IN DIRECTION WITH TIME AND OF SUFFICIENT INTENSITY TO IMPART MOVEMENT TO THE MAGNETIC ELEMENTS TO CAUSE THE PARTICULATE MATERIAL TO IMPINGE UPON AND TO COAT SAID EXPOSED SUBSTRATE SURFACE.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said established magnetic field rotates about a central axis.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said magnetic elements have an electromagnetic field of at least about 100 gauss.
Claim 5
Dependent Claim
20 words
The process of said claim 1 wherein said magnetic elements have a magnetization of at least 10 gauss per gram.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said magnetic elements are barium ferrite.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said particulate material is powdered aluminum.
Claim 8
Dependent Claim
25 words
A coated substrate comprising a substrate having a surface coating of a multitude of flattened particles adhered to said surface, said coating containing magnet elements.
Claim 9
Dependent Claim
25 words
A coated substrate comprising a substrate having a surface coating of a multitude of flattened particles adhered to said surface, said coating containing magnet elements.
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |