Patent US3687739A successfully refreshed from Google Patents.
US3687739A
Expired / Lapsed
US
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Coated metal and method
Assignee: Diamond Shamrock Corp
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Filing: 1970-12-10
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Granted: 1972-08-29
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Expires: 1990-12-10
Abstract
Abstract A COMPOSITE COATING PROVIDES ENHANCED CORROSION PROTECTION FOR METAL SUBSTRATES AND CAN MAINTAIN SUBSTRATE ELECTROCONDUCTIVITY, E.G., FOR WELDABILITY. THE UNDERCOATING ON THE SURFACE OF THE SUBSTRATE IS A RESIDUE IN INTIMATE MIXTURE WITH PULVERULENT METAL, WITH THE RESIDUE BEING OBTAINED FROM CURING AN APPLIED CORROSION-RESISTANT, HEXAVALENT-CHROMIUM-CONTAINING LIQUID COMPOSITION CONTAINING CHROMIC ACID. THE COATING OVER SUCH RESIDUE RESULTS FROM CURING AN APPLIED TOPCOAT COMPOSITION COMPRISING AN ELECTRICALLY CONDUCTIVE PIGMENT IN A VEHICLE.
Inventors
- 👤 Alexander W Kennedy
- 👤 Irving Malkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:54
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; B05D2350/00; B05D2350/60; B05D2350/65; B05D2601/00; B05D2601/20; B05D2601/28; B05D2701/00; B05D2701/40; B05D5/00; B05D5/12; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T428/12493; Y10T428/1266; Y10T428/12667; Y10T428/12729; Y10T428/12771; Y10T428/12778
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |