US3016339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting metal surfaces
Assignee: Pechiney SA
•
Filing: 1958-04-09
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Granted: 1962-01-09
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Expires: 1978-04-09
Abstract
No abstract record available.
Inventors
- 👤 Riou Marcel
- 👤 Richaud Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:35
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A METHOD OF SEALING AN ADSORBENT INORGANIC OXIDE PROTECTIVE LAYER WHICH IS PRODUCED ON AN OXIDIZABLE METALLIC SURFACE BY A CHEMICAL REACTION WITH THE METALLIC SURFACE, WHICH METHOD COMPRISES THE STEPS SUBSEQUENT TO THE FORMATION OF SAID INORGANIC PROTECTIVE LAYER OF: (A) IMMERSING THE METALLIC SURFACE HAVING THE AFORESAID INORGANIC LAYER IN A SEALING BATHE HAVING A PH OF 4-9, SAID SEALING BATH CONTAINING THEREIN AN ORGANIC POLYACID COMPOUND HAVING A MOLECULAR WEIGHT GREATER THAN 200, SAID COMPOUND ABEING ABSORBABLE BY SAID INORGANIC PROTECTIVE LAYER AND CONSISTING OF MOLECULES, EACH OF WHICH COMPRISES A CHAIN OF AT LEAST TWO CARBON ATOMS LINKED TOEACH OTHER BY SATURATED BOND, AT LEAST TWO ELECTRO-NEGATIVE SUBSTITUENTS, AT LEAST ONE OF WHICH IS AN ACIDIC GROUP, AND AT LEAST TWO ELECTRO POSITIVE GROUPS; (B) WITHDRAWING THE METAL SURFACE FROM SAID SEALING BATH; (C) RISINSING SAID WITHDRAWN METALLIC SURFACE WITH WATER TO REMOVE THE EXCESS OF BATH LIQUID UNADSORBED BY SAID INORGANIC LAYER FROM THE LATTER; AND (D) DRYING THE RESULTING SEALED SURFACE.
Claim 2
Independent Claim
167 words
A METHOD OF SEALING AN ADSORBENT INORGANIC OXIDE PROTECTIVE LAYER WHICH IS PRODUCED ON AN OXIDIZABLE METALLIC SURFACE BY A CHEMICAL REACTION WITH THE METALLIC SURFACE, WHICH METHOD COMPRISES THE STEPS SUBSEQUENT TO THE FORMATION OF SAID INORGANIC PROTECTIVE LAYER OF: (A) IMMERSING THE METALLIC SURFACE HAVING THE AFORESAID INORGANIC LAYER IN A SEALING BATHE HAVING A PH OF 4-9, SAID SEALING BATH CONTAINING THEREIN AN ORGANIC POLYACID COMPOUND HAVING A MOLECULAR WEIGHT GREATER THAN 200, SAID COMPOUND ABEING ABSORBABLE BY SAID INORGANIC PROTECTIVE LAYER AND CONSISTING OF MOLECULES, EACH OF WHICH COMPRISES A CHAIN OF AT LEAST TWO CARBON ATOMS LINKED TOEACH OTHER BY SATURATED BOND, AT LEAST TWO ELECTRO-NEGATIVE SUBSTITUENTS, AT LEAST ONE OF WHICH IS AN ACIDIC GROUP, AND AT LEAST TWO ELECTRO POSITIVE GROUPS; (B) WITHDRAWING THE METAL SURFACE FROM SAID SEALING BATH; (C) RISINSING SAID WITHDRAWN METALLIC SURFACE WITH WATER TO REMOVE THE EXCESS OF BATH LIQUID UNADSORBED BY SAID INORGANIC LAYER FROM THE LATTER; AND (D) DRYING THE RESULTING SEALED SURFACE.
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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) | 1965-01-08 | 1965-07-10 | 1966-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-08 | 1969-07-10 | 1970-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-08 | 1973-07-10 | 1974-01-09 | $7700.00 | Window Closed / Lapsed |