US2516685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing iron and aluminum surfaces to receive organic coatings and solution therefor
Assignee: Henkel Corp
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Filing: 1944-04-19
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Granted: 1950-07-25
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Expires: 1964-04-19
Abstract
No abstract record available.
Inventors
- 👤 Douty Alfred
- 👤 Snyder Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/78
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
IN A PROCESS FOR PROTECTING FERRIFEROUS AND ALUMINIFEROUS SURFACES WHEREIN A PRELIMINARY STEP IS SUBJECTING THE SURFACE TO A CLEANING TREATMENT AND THE FINAL STEP IS THE APPLICATION OF AN ORGANIC SURFACE-PROTECTIVE COATING, THE INERMEDIATE STEP WHICH IS THE FINAL CHEMICAL TREATMENT PRIOR TO THE APPLICATION OF SAID ORGANIC COATING, AND WHICH COMPRISES A FINAL RINSING OF THE SURFACE WITH A DILUTE AQUEOUS SOLUTION HAVING A SURFACE TENSION LOWER THAN 50 DYNES/CM., AND HAVING A PH VALUE NOT EXCEEDING 5, WHICH SOLUTION CONSISTS ESSENTIALLY OF WATER AND FROM .01% TO .10% OF AN ACID COMPONENT OF THE CLASS WHICH CONSISTS OF CHROMIC ACID, PHOSPHORIC ACID, AND MIXTURES THEREOF; AND A SURFACE-ACTIVE COMPONENT CONSISTING OF A NON-IONIC WETTING AGENT OPERATIVE TO REDUCE THE SURFACE TENSION OF THE SOLUTION.
References Cited (Backward Citations)
US2355823A
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US1549411A
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US1759762A
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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) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |