Patent US2813813A successfully refreshed from Google Patents.
US2813813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming protective phosphate coatings on metallic surfaces
Assignee: Parker Rust Proof Co
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Filing: 1953-12-11
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Granted: 1957-11-19
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
- 👤 Ley Hellmut
- 👤 Keller Heinz
- 👤 Kopp Heinrich Anton Karl
- 👤 Rausch Werner
- 👤 Fleischhauer Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:14
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD FOR FORMING A CHEMICAL PROTECTIVE COATING ON METALLIC SURFACES WHICH COMPRISES THE STEPS OF HEATING THE METALLIC SURFACE IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE ABOUT 400*C. TO FORM AN OXIDE COATING THEREON, HEATING THE OXIDE COATED SURFACE IN A REDUCING ATMOSPHERE TO REMOVE THE SAID OXIDED COATING AND FORM A METALLICLY CLEAN SURFACE COOLING SAID SURFACE TO A TEMPERATURE IN THE RANGE OF 100*C. TO 400*C. IN AN INERT ATMOSPHERE, AND CONTACTING THE SAID ARTICLE IN HEATED CONDITON WITH A PHOSPHATE COATING SOLUTION FOR A TIME SUFFICIENT TO FORM A PHOSPHATE COATING ON SAID SURFACE.
Claim 2
Independent Claim
98 words
A METHOD FOR FORMING A CHEMICAL PROTECTIVE COATING ON METALLIC SURFACES WHICH COMPRISES THE STEPS OF HEATING THE METALLIC SURFACE IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE ABOUT 400*C. TO FORM AN OXIDE COATING THEREON, HEATING THE OXIDE COATED SURFACE IN A REDUCING ATMOSPHERE TO REMOVE THE SAID OXIDED COATING AND FORM A METALLICLY CLEAN SURFACE COOLING SAID SURFACE TO A TEMPERATURE IN THE RANGE OF 100*C. TO 400*C. IN AN INERT ATMOSPHERE, AND CONTACTING THE SAID ARTICLE IN HEATED CONDITON WITH A PHOSPHATE COATING SOLUTION FOR A TIME SUFFICIENT TO FORM A PHOSPHATE COATING ON SAID SURFACE.
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |