Patent US2901385A successfully refreshed from Google Patents.
US2901385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-crystalline bonding coats for metal
Assignee: Individual
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Filing: 1957-10-30
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Granted: 1959-08-25
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Expires: 1977-10-30
Abstract
No abstract record available.
Inventors
- 👤 Leo P Curtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:38
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
PROCESS FOR PRODUCING AN ADHERENT MICRO-CRYSTALLINE CHROMINE-PHOSPHATE BONDING COAT ON FERROUS METAL SURFACES WHICH COMPRISES THE FOLLOWING SEQUENCE OF STEPS (1) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING A DICHROMATE SELECTED FROM THE CLASS WHICH CONSISTS OF BARIUM, CALCIUM, MAGNESIUM AND ZINC DICHROMATES, THE SOLUTION ALSO CONTAINING A REDUCING AGENT FOR SAID DICIROMATE, SAID REDUCING AGENT BEING PRESENT IN AMOUNT SUFFICIENT TO REDUCE SUBSTANTIALLY COMPLETELY THE HEXAVALENT CHROMIUM PRESENT, THE SOLUTION ALSO CONTAINING A PHOSPHORIC ACID COMPOUND SELECTED FROM THE CLASS WHICH CONSISTS OF BARIUM, CALCIUM, MAGNESIUM AND ZINC DIIHYDROGEN PHOSPHATES AND FREE PHOSPHORIC ACID, THE PHOSPHATE BEING LESS IN AMOUNT THAT THE DICHROMATE IN THE SOLUTION AND (2) DESTROYING SUBSTANTIALLY COMPLETELY HEXAVALENT CHROMIUM COMPOUNDS AND REDUCING AGENTS PRESENT IN THE FILM OF SAID DICHROMATE SOLUTION ADHERING TO THE METAL SURFACE BY HEATING TO A TEMPERATURE ABOVE 100*C. THE RESIDUE REMAINING ON THE METAL SURFACE CONSTITUTING AN ADHERENT, MICRO-CRYSTALLINE, CHROMINE-PHOSPHATE BENDING COAT.
Claim 2
Dependent Claim
153 words
PROCESS FOR PRODUCING AN ADHERENT MICRO-CRYSTALLINE CHROMINE-PHOSPHATE BONDING COAT ON FERROUS METAL SURFACES WHICH COMPRISES THE FOLLOWING SEQUENCE OF STEPS (1) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING A DICHROMATE SELECTED FROM THE CLASS WHICH CONSISTS OF BARIUM, CALCIUM, MAGNESIUM AND ZINC DICHROMATES, THE SOLUTION ALSO CONTAINING A REDUCING AGENT FOR SAID DICIROMATE, SAID REDUCING AGENT BEING PRESENT IN AMOUNT SUFFICIENT TO REDUCE SUBSTANTIALLY COMPLETELY THE HEXAVALENT CHROMIUM PRESENT, THE SOLUTION ALSO CONTAINING A PHOSPHORIC ACID COMPOUND SELECTED FROM THE CLASS WHICH CONSISTS OF BARIUM, CALCIUM, MAGNESIUM AND ZINC DIIHYDROGEN PHOSPHATES AND FREE PHOSPHORIC ACID, THE PHOSPHATE BEING LESS IN AMOUNT THAT THE DICHROMATE IN THE SOLUTION AND (2) DESTROYING SUBSTANTIALLY COMPLETELY HEXAVALENT CHROMIUM COMPOUNDS AND REDUCING AGENTS PRESENT IN THE FILM OF SAID DICHROMATE SOLUTION ADHERING TO THE METAL SURFACE BY HEATING TO A TEMPERATURE ABOVE 100*C. THE RESIDUE REMAINING ON THE METAL SURFACE CONSTITUTING AN ADHERENT, MICRO-CRYSTALLINE, CHROMINE-PHOSPHATE BENDING COAT.
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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |