US3901688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly reflective aluminum flake
Assignee: Huntington Alloys Corp
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Filing: 1973-11-19
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Granted: 1975-08-26
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Expires: 1993-11-19
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
- 👤 James T Casey
- 👤 Frank A Badia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
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; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12993
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
47 words
ALUMINUM FLAKE POWDER HAVING INDIVIDUAL PARTICLES CHARACTERIZED BY FLAT, SMOOTH SURFACES, BY A GENERALLY ROUNDED SHAPE WITH SMOOTH EDGES, BY A THICKNESS OF NOT MORE THAN ABOUT 1 MICRON AND, IN THE AGGREGATE, CHARACTERIZED IN THE UNPOLISHED CONDITION BY A SPECULAR REFLECTIVITY OF AT LEAST ABOUT 70%.
Claim 2
Dependent Claim
47 words
ALUMINUM FLAKE POWDER HAVING INDIVIDUAL PARTICLES CHARACTERIZED BY FLAT, SMOOTH SURFACES, BY A GENERALLY ROUNDED SHAPE WITH SMOOTH EDGES, BY A THICKNESS OF NOT MORE THAN ABOUT 1 MICRON AND, IN THE AGGREGATE, CHARACTERIZED IN THE UNPOLISHED CONDITION BY A SPECULAR REFLECTIVITY OF AT LEAST ABOUT 70%.
Claim 3
Dependent Claim
16 words
Aluminum flake powder according to claim 1 having a specular reflectivity of at least about 80%.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |