US3619441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal treatment to prevent corrosion and blemishes in metal reinforced concrete structures
Assignee: Southern Block and Pipe Corp
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Filing: 1969-04-03
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Granted: 1971-11-09
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Expires: 1989-04-03
Abstract
Abstract Concrete reinforced with galvanized metal that has received a sodium chromate treatment that forms a protective coating on the galvanized metal to prevent blemishes in the finished concrete product caused by chemical reactions between the zinc and the alkalis of the concrete.
Inventors
- 👤 Knox Ryan Burchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:24
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
The method of claim 1 wherein said aqueous treating composition is constituted by 4 pounds of an alkali metal chromate or dichromate to each 100 pounds of water.
Claim 2
Dependent Claim
28 words
The method of claim 1 wherein the alkali metal chromate or dichromate is selected form the class consisting of sodium bichromate, sodium dichromate, ammonium dichromate and potassium dichromate.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |