Patent US2724668A successfully refreshed from Google Patents.
US2724668A
Expired / Lapsed
US
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Combination cleaning and coating solution for metallic surfaces and method of forming coatings therewith
Assignee: Parker Rust Proof Co
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Filing: 1952-10-03
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Granted: 1955-11-22
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Expires: 1972-10-03
Abstract
No abstract record available.
Inventors
- 👤 William S Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:10
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/34; C23C22/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
A COMPOSITION OF MATTER FOR FORMING BY SPRAYING, A PHOSPHATE COATING ON METALLIC SURFACES WHICH CONSISTS ESSENTIALLY OF AN AQUEOUS ALKALI METAL PHOSPHATE SOLUTION CONTAINING AN OXIDIZING AGENT, AND .01% TO 2% OF AN ALKALI METAL LIGNOSULFONATE, SAID SOLUTION HAVING A PH OF 4.2 TO 6.0.
References Cited (Backward Citations)
GB557846A
Cited
US2516685A
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US2403426A
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US2479423A
Cited
US2491832A
Cited
US2505457A
Cited
US2609308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |