US4361630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-black coating due to surface morphology
Assignee: United States Department of Commerce
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Filing: 1981-08-18
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Granted: 1982-11-30
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Expires: 2001-08-18
Abstract
Abstract The invention provides a method of producing an ultra-black surface coating, having an extremely high light absorption capacity, on a substrate, such as a metal, ceramic, glass, or plastic, the blackness being associated with a unique surface morphology consisting of a dense array of microscopic pores etched into the surface, as well as the resulting coated substrate. The ultra-black surface, which has a spectral reflectance on the order of about from 0.5 to 1.0% at wavelengths of light of about from 320 to 2140 nanometers, finds use as a solar collector in the field of solar energy.
Inventors
- 👤 Christian E. Johnson, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/32; C23C18/34; C23C18/36; Y; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12118; Y10T428/12479; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875; Y10T428/12944; Y10T428/12993; Y10T428/24; Y10T428/24355
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
A substrate coated with a nickel-phosphorous alloy having an ultra-black surface, the blackness being associated with a unique surface morphology consisting of a dense array of microscopic pores etched into the surface, said ultra-black surface having a spectral reflectance on the order of approximately from 0.5 to 1.0% at wavelengths of light of about from 320 to 2140 nanometers, wherein said pores are conical and have a diameter and spacing such that said surface morphology includes substantially no land area of nickel-phosphorous alloy between said conical pores.
Claim 2
Dependent Claim
87 words
A substrate coated with a nickel-phosphorous alloy having an ultra-black surface, the blackness being associated with a unique surface morphology consisting of a dense array of microscopic pores etched into the surface, said ultra-black surface having a spectral reflectance on the order of approximately from 0.5 to 1.0% at wavelengths of light of about from 320 to 2140 nanometers, wherein said pores are conical and have a diameter and spacing such that said surface morphology includes substantially no land area of nickel-phosphorous alloy between said conical pores.
Claim 3
Dependent Claim
27 words
The coated substrate of claim 1, wherein the average maximum diameter, depth, and spacing of the pores range from a fraction of a micrometer to several micrometers.
References Cited (Backward Citations)
US3615948A
Cited
US3533863A
Cited
US4154705A
Cited
US3867207A
Cited
US3899400A
Cited
US3932694A
Cited
US3953624A
Cited
US4008343A
Cited
US4209008A
Cited
JPS5448344A
Cited
US4160049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |