US2610133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes of brightening and passivating cadmium and zinc
Assignee: RCA Corp
•
Filing: 1949-10-26
•
Granted: 1952-09-09
•
Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Francis X Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:54
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; C23F3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS OF BRIGHTENING AND PASSIVATING A METALLIC SURFACE OF AT LEAST ONE SUBSTANTIALLY PURE METAL FROM THE CLASS CONSISTING OF CADMIUM AND ZINC, COMPRISING TREATING SAID SURFACE WITH AN AQUEOUS SOLUTION OF NITRIC ACID IN WHICH THE ACID CONCENTRATION IS ABOUT 0.1 TO 3% BY VOLUME, THEN TREATING SAID SURFACE WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 1 TO 6 OUNCES OF AN ALKALI DICHROMATE SALT AND ABOUT 1 TO 8 OUNCES OF A WETTING AGENT PER GALLON OF WATER, RINSING THE TREATED SURFACE, AND DRYING, SAID PROCESS BEING CARRIED OUT WITHOUT PERMITTING THE ARTICLE BEING TREATED TO STAND FOR ANY APPRECIABLE TIME BETWEEN SUCCESSIVE STEPS.
Claim 2
Dependent Claim
108 words
A PROCESS OF BRIGHTENING AND PASSIVATING A METALLIC SURFACE OF AT LEAST ONE SUBSTANTIALLY PURE METAL FROM THE CLASS CONSISTING OF CADMIUM AND ZINC, COMPRISING TREATING SAID SURFACE WITH AN AQUEOUS SOLUTION OF NITRIC ACID IN WHICH THE ACID CONCENTRATION IS ABOUT 0.1 TO 3% BY VOLUME, THEN TREATING SAID SURFACE WITH AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF ABOUT 1 TO 6 OUNCES OF AN ALKALI DICHROMATE SALT AND ABOUT 1 TO 8 OUNCES OF A WETTING AGENT PER GALLON OF WATER, RINSING THE TREATED SURFACE, AND DRYING, SAID PROCESS BEING CARRIED OUT WITHOUT PERMITTING THE ARTICLE BEING TREATED TO STAND FOR ANY APPRECIABLE TIME BETWEEN SUCCESSIVE STEPS.
References Cited (Backward Citations)
US2035380A
Cited
US2186579A
Cited
US2446060A
Cited
US2479423A
Cited
US2465247A
Cited
US2477310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |