US2769774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition method
Assignee: Republic Steel Corp
•
Filing: 1952-08-05
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Granted: 1956-11-06
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Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Theron A Loveland
- 👤 Alvin F Prust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF CONVERING A METAL ARTICLE WITH A CORROSION-RESISTANT COATING WHICH COMPRISES THE STEPS OF CONTACTING THE METAL ARTICLE WITH A LIQUID BODY CONSISTING ESSENTIALLY OF WATER AND BETWEEN ABOUT 10% AND ABOUT 35% CHROMIC ACID AND BETWEEN ABOUT 3% AND BOUT 12% PHOSPHORIC ACID IN THE RATIO RANGE TO EACH OTHER ABOUT TWO PARTS AND ABOUT THREE PARTS OF CHROMIC ACID PER PART OF PHOSPHORIC ACID, CONTACTING A LEAD BODY WITH SAID LIQUID BODY AT A POINT SPACED FROM SAID METAL ARTICLE, ELECTRICALLY CONNECTING SAID LEAD BODY AND SAID ARTICLE IN AN ELECTRIC CIRCUIT AS AN ANODE AND A CATHODE RESPECTIVELY, AND PASSING AN ELECTRIC CURRENT OF DENSITY BETWEEN ABOUT 75 AMPERES AND ABOUT 500 AMPERES PER SQUARE FOOT OF CATHODE SURFACE THROUGH SAID ELECTRIC CIRCUIT AND THROUGH SAID LIQUID BODY AS AN ELECTROLYTE FOR BETWEEN ABOUT ONE AND ABOUT 20 SECONDS.
Claim 2
Independent Claim
144 words
THE METHOD OF CONVERING A METAL ARTICLE WITH A CORROSION-RESISTANT COATING WHICH COMPRISES THE STEPS OF CONTACTING THE METAL ARTICLE WITH A LIQUID BODY CONSISTING ESSENTIALLY OF WATER AND BETWEEN ABOUT 10% AND ABOUT 35% CHROMIC ACID AND BETWEEN ABOUT 3% AND BOUT 12% PHOSPHORIC ACID IN THE RATIO RANGE TO EACH OTHER ABOUT TWO PARTS AND ABOUT THREE PARTS OF CHROMIC ACID PER PART OF PHOSPHORIC ACID, CONTACTING A LEAD BODY WITH SAID LIQUID BODY AT A POINT SPACED FROM SAID METAL ARTICLE, ELECTRICALLY CONNECTING SAID LEAD BODY AND SAID ARTICLE IN AN ELECTRIC CIRCUIT AS AN ANODE AND A CATHODE RESPECTIVELY, AND PASSING AN ELECTRIC CURRENT OF DENSITY BETWEEN ABOUT 75 AMPERES AND ABOUT 500 AMPERES PER SQUARE FOOT OF CATHODE SURFACE THROUGH SAID ELECTRIC CIRCUIT AND THROUGH SAID LIQUID BODY AS AN ELECTROLYTE FOR BETWEEN ABOUT ONE AND ABOUT 20 SECONDS.
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |