US2514149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating of metal surfaces
Assignee: Parker Rust Proof Co
•
Filing: 1948-09-04
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Granted: 1950-07-04
•
Expires: 1968-09-04
Abstract
No abstract record available.
Inventors
- 👤 Amundsen Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:11
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A MULTIPLE STEP PHOSPHATE COATING PROCESS FOR FERROUS METALS IN WHICH A PLURALITY OF SEPARATE BATHS ARE EMPLOYED, EACH BATH COMPRISING AN ACID PHOSPHATE SOLUTION CONTAINING ZINC AND FERROUS IRON, THE FIRST BATH HAVING A HIGHER IRON CONTENT AND A LOWER ZINC CONTENT THAN DO THE SUBSEQUENT BATHS, THE NOVEL STEPS OF IMMERSING A FERROUS METAL IN SAID FIRST BATH UNTIL A SUBSTANTIAL COATING IS FORMED ON THE SURFACE OF THE METAL, REMOVING THE COATED METAL SURFACE FROM THE BATH BEFORE THE COATING ACTION IS COMPLETED, IMMERSING SAID PARTIALLY COATED SURFACE SUCCESSIVELY INTO SUBSEQUENT BATHS BEFORE THE FIRST SOLUTION HAS DRIED ON THE SURFACE AND REMOVING THE COMPLETELY COATED SURFACE FROM THE BATH HAVING THE LOWEST FERROUS IRON CONTENT AND THE HIGHEST ZINC CONTENT.
References Cited (Backward Citations)
US1219526A
Cited
US2449495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |