Patent US2502476A successfully refreshed from Google Patents.
US2502476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing transparent protective films on zinc or cadmium
Assignee: Rheem Manufacturing Co
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Filing: 1948-06-02
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Granted: 1950-04-04
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Expires: 1968-06-02
Abstract
No abstract record available.
Inventors
- 👤 Lawrence H Ott
- 👤 James T Shewbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:03
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
AN AQUEOUS SOLUTION FOR USE IN THE TREATMENT OF METALS SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM TO PRESERVE THE LUSTER THEREOF AND REDUCE OXIDATION CONSISTING ESSENTIALLY OF A 1:1 RATIO OF AN EQUAL NUMBER OF GRAMS OF CHROMIUM TRIOXIDE TO AN EQUAL NUMBER OF MILLILITERS OF HYDROCHLORIC ACID (36 TO 38%).
Claim 2
Dependent Claim
54 words
AN AQUEOUS SOLUTION FOR USE IN THE TREATMENT OF METALS SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM TO PRESERVE THE LUSTER THEREOF AND REDUCE OXIDATION CONSISTING ESSENTIALLY OF A 1:1 RATIO OF AN EQUAL NUMBER OF GRAMS OF CHROMIUM TRIOXIDE TO AN EQUAL NUMBER OF MILLILITERS OF HYDROCHLORIC ACID (36 TO 38%).
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) | 1953-04-03 | 1953-10-03 | 1954-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-03 | 1957-10-03 | 1958-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-03 | 1961-10-03 | 1962-04-04 | $7700.00 | Window Closed / Lapsed |