Patent US3941584A successfully refreshed from Google Patents.
US3941584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of reflective metal flake pigments
Assignee: Huntington Alloys Corp
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Filing: 1974-06-19
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Granted: 1976-03-02
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Expires: 1994-06-19
Abstract
Abstract Directed to a metal flake powder of a stain-resistant metal or alloy and a process for producing the same wherein a metal powder of -100 mesh size is ball milled in a mobile liquid medium wherein the ratio of mobile liquid to powder being milled is at least about 10 to 1, e.g., about 25:1 to about 50:1.
Inventors
- 👤 John Hayes Tundermann
- 👤 John Herbert Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:05
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; B22F1/00; B22F1/06; B22F1/068; C; C09; C09C; C09C1/00; C09C1/62; C09C1/622; C09C1/66; B22F2009/041; B22F2009/043; B22F2998/00; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/20; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/32; C01P2006/33; C01P2006/34; C01P2006/60; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
A metal flake powder consisting essentially of solid opaque flakes of metal each flake having a thickness of less than one micron; said flakes having essentially smooth, defect free, mechanically formed faces with major dimensions of about 10 to 40 microns; said powder being capable of being formed as a water floated layer and exhibiting, when formed as a water floated layer of minus 325 mesh particles a high specular reflectance of at least 30 percent as measured by aiming a beam of parallel light rays generated by a tungsten filament light source at an angle of 30° from the vertical and detecting the specularly reflected light, as affected by the absorption characteristics of the material tested, by a photo cell sensitive in the range of 300 to 700 millimicrons wavelength; and said metal flakes being coated with a thin lubricant film adapted to provide leafing characteristics to said flakes when said lubricant film is not wetted by a coating composition vehicle and to provide non-leafing characteristics to said flakes when said lubricant film is wetted by a coating composition vehicle.
Claim 2
Dependent Claim
181 words
A metal flake powder consisting essentially of solid opaque flakes of metal each flake having a thickness of less than one micron; said flakes having essentially smooth, defect free, mechanically formed faces with major dimensions of about 10 to 40 microns; said powder being capable of being formed as a water floated layer and exhibiting, when formed as a water floated layer of minus 325 mesh particles a high specular reflectance of at least 30 percent as measured by aiming a beam of parallel light rays generated by a tungsten filament light source at an angle of 30° from the vertical and detecting the specularly reflected light, as affected by the absorption characteristics of the material tested, by a photo cell sensitive in the range of 300 to 700 millimicrons wavelength; and said metal flakes being coated with a thin lubricant film adapted to provide leafing characteristics to said flakes when said lubricant film is not wetted by a coating composition vehicle and to provide non-leafing characteristics to said flakes when said lubricant film is wetted by a coating composition vehicle.
Claim 3
Dependent Claim
23 words
A metal flake powder in accordance with claim 1 wherein the average flake thickness is in the range of 0.27 to 0.94 micron.
Claim 4
Dependent Claim
18 words
A metal flake powder as in claim 1 wherein each flake is characterized by generally rounded smooth edges.
Claim 5
Dependent Claim
64 words
A metal flake powder in accordance with claim 1 having a composition containing, by weight, up to about 90% copper, up to about 10% maganese, up to about 3% molybdenum, up to about 70% zinc, up to about 70% tin, up to about 10% silver, and the balance essentially a metal from the group consisting of nickel, iron, cobalt, chromium and the platinum-group metals.
Claim 6
Dependent Claim
44 words
A metal flake powder in accordance with claim 1 made of a metal from the group consisting of nickel; cobalt; alloys of nickel, iron and cobalt with each other and with, optionally, chromium; stainless steels; nickel-copper alloys; nickel-chromium alloys; nickel-chromium-iron alloys and nickel-silver alloys.
Claim 7
Dependent Claim
22 words
A metal flake powder in accordance with claim 1 having a thickness of less than 1 micron and made of carbonyl nickel.
Claim 8
Dependent Claim
23 words
A metal flake powder in accordance with claim 1 having a thickness of less than 1 micron and made of a stainless steel.
Claim 9
Dependent Claim
20 words
A metal flake powder in accordance with claim 1 wherein said metal has a melting point of at least 1100°C.
Claim 10
Dependent Claim
19 words
A metal flake powder in accordance with claim 1 wherein said metal has a density of at least 7.5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |