US3790355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated metal article and method of coating
Assignee: EMPIRE PLATING CO
•
Filing: 1971-11-18
•
Granted: 1974-02-05
•
Expires: 1991-11-18
Abstract
Abstract A metal article having a corrosion-resistant, adherent surfacecovering, hydrophobic, thermosetting polymer film. A method of coating a metal article to make it resistant to corrosion comprising the steps of forming a metallic chromating surface thereof, applying a hydrophobic, thermosetting polymer to a surface thereof and heating the article at a temperature of at least about 300* F. to convert the polymer into a hard, adherent film.
Inventors
- 👤 S Palisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:36
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; B; B05; B05D; B05D3/00; B05D3/10; B05D3/102; B05D7/00; B05D7/14; C25; C25D; C25D5/00; C25D5/48; B05D2202/00; B05D2350/00; B05D2350/10; B05D2350/20; B05D3/02; B05D3/0254; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12583; Y10T428/12736; Y10T428/12771; Y10T428/12778; Y10T428/31504; Y10T428/31942
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A metal article composed of a metal selected from the group of metals consisting of aluminum, iron, brass, copper alloys and zinc, having an electrodeposited coating on a surface thereof selected from the group of metals consisting of zinc, cadmium, nickel and chromium, said coating having a chromated surface formed by being treated for between about 15 seconds and about 25 seconds with water containing between about 6 oz. and about 16 oz. per gallon of a liquid composed of about 90 percent of CrO3 and about 10 percent of sodium bisulphate followed by rinsing the chromated surface with water, and a film of hydrophobic thermosetting polymer adhering to said chromated surface, which film has been hardened by heating the article to above about 300* F.
Claim 2
Independent Claim
179 words
A method of protecting a metallic surface to render it highly resistant to salt spray corrosion and to abrasion, wherein the surface is composed of a metal selected from the group of metals consisting of aluminum, iron, zinc, brass and copper alloys, comprising the steps of: a. electroplating the surface with a metal selected from the group of metals consisting of zinc, cadmium, nickel and chromium; b. chromating the electroplated surface to produce a clear, blemish free colorless chromate coating thereon by treating it for between about 15 seconds and about 25 seconds with water containing between about 6 oz. and about 16 oz. per gallon of a liquid composed of about 90 percent of CrO3 and about 10 percent sodium bisulphate; c. rinsing the chromated surface with water to flush away chromating solution remaining thereon; d. coating the chromated surface with a transparent colorless hydrophobic thermosetting polymer; and e. heating the article to above about 300* F to convert the polymer to a hard, colorless transparent film thereby providing the surface with a blemish free corrosion resistant finish.
References Cited (Backward Citations)
US2746915A
Cited
US3526486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |