US2634224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightening and passivating solution
Assignee: Underwood Corp
•
Filing: 1949-12-22
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Granted: 1953-04-07
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Expires: 1969-12-22
Abstract
No abstract record available.
Inventors
- 👤 Armand W Faucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:07
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; C23F3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A SOLUTION FOR USE IN BRIGHTENING A PASSIVATING THE SURFACE OF ZINC OR CADMIUM ARTICLES CONSISTING OF AN AQUEOUS SOLUTION CMPOSED OF 50 TO 300 GRAMS OF CHROMIC ACID PER LITER OF SOLUTION, 3 TO 24 GRAMS OF SULPHURIC ACID PER LITER OF SOLUTION, 25 TO 66% AS MUCH ORTHO-PHOSPHORIC ACID AS SULPHURIC ACID, AND SUFFICIENT NITRIC ACID TO PREVENT THE SURFACE FROM STREAKING.
Claim 2
Dependent Claim
64 words
A SOLUTION FOR USE IN BRIGHTENING A PASSIVATING THE SURFACE OF ZINC OR CADMIUM ARTICLES CONSISTING OF AN AQUEOUS SOLUTION CMPOSED OF 50 TO 300 GRAMS OF CHROMIC ACID PER LITER OF SOLUTION, 3 TO 24 GRAMS OF SULPHURIC ACID PER LITER OF SOLUTION, 25 TO 66% AS MUCH ORTHO-PHOSPHORIC ACID AS SULPHURIC ACID, AND SUFFICIENT NITRIC ACID TO PREVENT THE SURFACE FROM STREAKING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |