US2745801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium plating
Assignee: Harshaw Chemical Co
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Filing: 1955-03-14
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Granted: 1956-05-15
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Expires: 1975-03-14
Abstract
No abstract record available.
Inventors
- 👤 Blaine Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:43
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS CAPABLE OF PRODUCING ADHERENT CHROMIUM DEPOSITS OF IMPROVED LUSTRE ON BRIGHT SURFACES OF THE CLASS CONSISTING OF ANTIMONY, TIN, SILVER AND LEAD COMPRISING ELECTROLYZING BETWEEN AN ANODE SURFACE AND A BRIGHT CATHODE SURFACE OF THE CLASS CONSISTING OF BRIGHT ANTIMONY, BRIGHT TIN, BRIGHT SILVER AND BRIGHT LEAD SURFACES, AN AQUEOUS SOLUTION ESSENTIALLY CONSISTING OF WATER, CHROMIC ACID, ACETATE ION AND SULFATE ION, ACETATE ION BEING PRESENT IN CONCENTRATION FROM ABOUT 15 TO ABOUT 35% OF THE CHROMIC ACID BY WEIGHT, SULFATE ION BEING PRESENT TO THE EXTENT OF FROM ABOUT 0.3 TO ABOUT 1.0 PER CENT OF THE CHROMIC ACID BY WEIGHT AND CHROMIC ACID BEING PRESENT IN CONCENTRATION FROM ABOUT 100 TO ABOUT 700 GRAMS PER LITER.
Claim 2
Dependent Claim
120 words
A PROCESS CAPABLE OF PRODUCING ADHERENT CHROMIUM DEPOSITS OF IMPROVED LUSTRE ON BRIGHT SURFACES OF THE CLASS CONSISTING OF ANTIMONY, TIN, SILVER AND LEAD COMPRISING ELECTROLYZING BETWEEN AN ANODE SURFACE AND A BRIGHT CATHODE SURFACE OF THE CLASS CONSISTING OF BRIGHT ANTIMONY, BRIGHT TIN, BRIGHT SILVER AND BRIGHT LEAD SURFACES, AN AQUEOUS SOLUTION ESSENTIALLY CONSISTING OF WATER, CHROMIC ACID, ACETATE ION AND SULFATE ION, ACETATE ION BEING PRESENT IN CONCENTRATION FROM ABOUT 15 TO ABOUT 35% OF THE CHROMIC ACID BY WEIGHT, SULFATE ION BEING PRESENT TO THE EXTENT OF FROM ABOUT 0.3 TO ABOUT 1.0 PER CENT OF THE CHROMIC ACID BY WEIGHT AND CHROMIC ACID BEING PRESENT IN CONCENTRATION FROM ABOUT 100 TO ABOUT 700 GRAMS PER LITER.
References Cited (Backward Citations)
US1542549A
Cited
US2623847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |