Patent US4145462A successfully refreshed from Google Patents.
US4145462A
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Process for producing solar collectors
Assignee: Toyo Aluminum KK
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Filing: 1977-05-25
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Granted: 1979-03-20
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Expires: 1997-05-25
Abstract
Abstract A process for producing solar collectors of aluminum or aluminum alloys having a selective absorptive coating. Aluminum or its alloy is dipped in a hot aqueous solution containing a silicate. Aluminum alloys can be also used which contain alloying elements such as iron, copper, titanium, nickel, silver and gold.
Inventors
- 👤 Masamichi Kuwabara
- 👤 Mitsuo Sasaki
- 👤 Sigeru Uema
- 👤 Youkichi Taniguchi
- 👤 Noboru Fukuchi
- 👤 Tohru Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:41
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; F; F24; F24S; F24S70/00; F24S70/20; F24S70/225; F24S70/25; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A process for manufacturing solar collectors which consists essentially of the step of dipping aluminum or aluminum alloy in a hot alkaline aqueous solution containing 5-100 mg, in terms of SiO 2 , of a silicate per liter of water, whereby there is formed a selective absorption coating thereon, wherein said hot aqueous solution further contains at least one kind of ions selected from the group consisting of zinc, magnesium, calcium, strontium and beryllium in the amounts of 3-30 mg/l, 5-35 mg/l, 1-20 mg/l, 1-20 mg/l and 1-20 mg/l, respectively.
Claim 2
Dependent Claim
90 words
A process for manufacturing solar collectors which consists essentially of the step of dipping aluminum or aluminum alloy in a hot alkaline aqueous solution containing 5-100 mg, in terms of SiO 2 , of a silicate per liter of water, whereby there is formed a selective absorption coating thereon, wherein said hot aqueous solution further contains at least one kind of ions selected from the group consisting of zinc, magnesium, calcium, strontium and beryllium in the amounts of 3-30 mg/l, 5-35 mg/l, 1-20 mg/l, 1-20 mg/l and 1-20 mg/l, respectively.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein said hot alkaline aqueous solution is at 80° C. or higher.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the water used for preparing said alkaline aqueous solution is deionized or distilled.
Claim 5
Dependent Claim
40 words
A process according to claim 1 wherein the contents of iron, potassium and chromium ions in the water used for preparing said alkaline aqueous solution are 1.0 mg/l or less, 8.0 mg/l or less and 1.0 mg/l or less, respectively.
Claim 6
Dependent Claim
43 words
A process according to claim 1 wherein said aluminum alloy contains at least one alloying element selected from the group consisting of iron, copper, titanium, nickel, silver and gold in the amounts of 0.05-2.0% by weight, 0.05-4.0%, 0.05-1.0%, 0.03-1.0%, 0.05-1.0% and 0.05-0.5%, respectively.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |