Patent US2846342A successfully refreshed from Google Patents.
US2846342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding coats for metal
Assignee: Individual
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Filing: 1955-09-30
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Granted: 1958-08-05
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Expires: 1975-09-30
Abstract
No abstract record available.
Inventors
- 👤 Leo P Curtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33; C23C22/73; C23C22/74; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
PROCESS FOR PRODUCING AN ADHERENT BONDING COAT ON ALUMINUM, ZINC AND FERROUS METAL SURFACES WHICH COMPRISES THE FOLLOWING SEQUENCE OF STEPS: (1) FREEING THE METAL SURFACE FROM WATER-BREAKS (2) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING CHROMATE SELECTED FROM THE CLASS WHICH CONSIST OF CHROMIC ACID AND AMMONIUM DICHROMATE, THE SOLUTION ALSO CONTAINING A HYPOPHOSPHITE REDUCING AGENT FOR SAID CHROMATE SELECTED FROM THE CLASS WHICH CONSISTS OF FREE HYPOPHOSPHOROUS ACID AND CALCIUM, MAGNESIUM AND ZINC HYPOPHOSPHOROUS AND (3) DESTROYING SUBSTANTIALLY COMPLETELY OXIDANTS AND REDUCING SUBSTANCES PRESENT IN THE FILM OF SAID CHROMATE SOLUTION ADHERING TO THE METAL SURFACE BY HEATING TO A TEMPERATURE ABOVE 100* C., THE RESIDUE REMAINING ON THE METAL SURFACE CONSTITUTING AN ADHERENT, CHROMIC HYDROXIDE-PHOSPHATE BONDING COAT.
Claim 2
Dependent Claim
121 words
PROCESS FOR PRODUCING AN ADHERENT BONDING COAT ON ALUMINUM, ZINC AND FERROUS METAL SURFACES WHICH COMPRISES THE FOLLOWING SEQUENCE OF STEPS: (1) FREEING THE METAL SURFACE FROM WATER-BREAKS (2) WETTING THE METAL SURFACE WITH A SOLUTION CONTAINING CHROMATE SELECTED FROM THE CLASS WHICH CONSIST OF CHROMIC ACID AND AMMONIUM DICHROMATE, THE SOLUTION ALSO CONTAINING A HYPOPHOSPHITE REDUCING AGENT FOR SAID CHROMATE SELECTED FROM THE CLASS WHICH CONSISTS OF FREE HYPOPHOSPHOROUS ACID AND CALCIUM, MAGNESIUM AND ZINC HYPOPHOSPHOROUS AND (3) DESTROYING SUBSTANTIALLY COMPLETELY OXIDANTS AND REDUCING SUBSTANCES PRESENT IN THE FILM OF SAID CHROMATE SOLUTION ADHERING TO THE METAL SURFACE BY HEATING TO A TEMPERATURE ABOVE 100* C., THE RESIDUE REMAINING ON THE METAL SURFACE CONSTITUTING AN ADHERENT, CHROMIC HYDROXIDE-PHOSPHATE BONDING 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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |