US2541083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroplating on aluminum
Assignee: Unisys Corp
•
Filing: 1945-08-25
•
Granted: 1951-02-13
•
Expires: 1965-08-25
Abstract
No abstract record available.
Inventors
- 👤 Edward B Mcdermott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:20
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD OF PLATING ALUMINUM ALLOYS WHICH CONSISTS OF THE STEP OF PRODUCING A SURFACE OF SUBSTANTIALLY PURE ALUMINUM ON THE ARTICLE TO BE PLATED BY PICKLING THE SAME IN A NITRIC-HYDROFLUORIC ACID DIP OF 90% TO 99% OF CONCENTRATED NITRIC ACID (67%) WITH THE BALANCE OF CONCENTRATED HYDROFLUORIC ACID (48%), THE DIP BEING PROPORTIONED IN ACCORDANCE WITH THE TYPE OF ALLOY SELECTIVELY TO DISSOLVE ASSOCIATED ALLOYING INGREDIENTS FROM THE SURFACE OF THE ARTICLE WHILE THE HYDROFLUORIC ACID IS PRESENT IN AN AMOUNT INSUFFICIENT TO CAUSE THE EVOLUTION OF GAS, THEN ANODIZING THE ARTICLE IN A SODIUM CARBONATE SOLUTION BY ALTERNATING CURRENT, AND THEREAFTER ELECTROPLATING THE ANODIZED SURFACE OF THE ARTICLE.
Claim 2
Independent Claim
111 words
THE METHOD OF PLATING ALUMINUM ALLOYS WHICH CONSISTS OF THE STEP OF PRODUCING A SURFACE OF SUBSTANTIALLY PURE ALUMINUM ON THE ARTICLE TO BE PLATED BY PICKLING THE SAME IN A NITRIC-HYDROFLUORIC ACID DIP OF 90% TO 99% OF CONCENTRATED NITRIC ACID (67%) WITH THE BALANCE OF CONCENTRATED HYDROFLUORIC ACID (48%), THE DIP BEING PROPORTIONED IN ACCORDANCE WITH THE TYPE OF ALLOY SELECTIVELY TO DISSOLVE ASSOCIATED ALLOYING INGREDIENTS FROM THE SURFACE OF THE ARTICLE WHILE THE HYDROFLUORIC ACID IS PRESENT IN AN AMOUNT INSUFFICIENT TO CAUSE THE EVOLUTION OF GAS, THEN ANODIZING THE ARTICLE IN A SODIUM CARBONATE SOLUTION BY ALTERNATING CURRENT, AND THEREAFTER ELECTROPLATING THE ANODIZED SURFACE OF THE ARTICLE.
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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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |