Patent US3776473A successfully refreshed from Google Patents.
US3776473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly reflective aluminum flake
Assignee: EMICO Inc
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Filing: 1972-03-27
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Granted: 1973-12-04
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Expires: 1992-03-27
Abstract
Abstract Aluminum flake powder having high specular reflectivity is produced by wet ball milling aluminum powder in the presence of a lubricant using a volume ratio of grinding balls to powder of at least 15:1 and a volume ratio of grinding balls to milling liquid (e.g., a light liquid hydrocarbon) which preferably is substantially equal.
Inventors
- 👤 J Casey
- 👤 F Badia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:17
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; B22F1/00; B22F1/06; B22F1/068; C; C09; C09C; C09C1/00; C09C1/62; C09C1/64; C09C1/644; C09C1/646; B22F2009/043; B22F2998/00; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/20; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
The method of claim 1 wherein the volume ratio of grinding balls to powder does not exceed about 75:1 and the volume ratio of grinding balls to milling liquid is substantially equal.
Claim 2
Dependent Claim
14 words
The method of claim 1 wherein the milling liquid is a light liquid hydrocarbon.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the aluminum powder treated is substantially spherical in shape and has an average particle size in the range of about 4 to about 300 microns.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein the grinding balls are steel balls having an average diameter not substantially exceeding about 5/16 inch and the milling time does not exceed about 2 hoUrs.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the lubricant is a fatty acid.
Claim 6
Dependent Claim
11 words
The method of claim 3 wherein the lubricant is stearic acid.
References Cited (Backward Citations)
US2002891A
Cited
US3709439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |