Patent US2935403A successfully refreshed from Google Patents.
US2935403A
Expired / Lapsed
US
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Prussian blue image forming process
Assignee: Horizon Inc
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Filing: 1958-04-25
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Granted: 1960-05-03
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Expires: 1978-04-25
Abstract
No abstract record available.
Inventors
- 👤 Malon H Dickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:15
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/64; G03C1/76; G03C1/77
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS OF FORMING A PRUSSIAN BLUE IMAGE ON AN ALUMINUM BASE METAL SURFACE WHICH COMPRISES: ANODIZING THE ALUMINUM BASE METAL SURFACE TO FORM A POROUS OXIDE SURFACE LAYER THEREON, IMMERSING THE ANODIZED SURFACE IN A SENSITIZING SOLUTION COMPRISING A 30% SOLUTION OF FERRIC AMMONIUM CITRATE, EXPOSING THE SENSITIZED SURFACE TO A PATTERN OF ILLUMINATION, TREATING THE SURFACE, AFTER SAID EXPOSURE, WITH A SOLUTION OF POTASSIUM FERROCYANIDE, FOR BETWEEN ABOUT 10 AND 30 SECONDS, AND WITH SUFFICIENT AGITATION TO WASH AWAY SPURIOUS IMAGES, INTENSIFYING AND DEVELOPING A PRUSSIAN BLUE IMAGE CORRESPONDING TO THE PATTERN OF ILLUMINATION BY APPLYING A VERY WEAK AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO SAID SURFACE AND THEREAFTER SEALING THE INTENSIFIED IMAGE IN THE POROUS METAL SURFACE BY IMMERSING THE SURFACE BEARING THE INTENSIFIED IMAGE IN BOILING WATER FOR ABOUT 30 MINUTES.
Claim 2
Dependent Claim
135 words
A PROCESS OF FORMING A PRUSSIAN BLUE IMAGE ON AN ALUMINUM BASE METAL SURFACE WHICH COMPRISES: ANODIZING THE ALUMINUM BASE METAL SURFACE TO FORM A POROUS OXIDE SURFACE LAYER THEREON, IMMERSING THE ANODIZED SURFACE IN A SENSITIZING SOLUTION COMPRISING A 30% SOLUTION OF FERRIC AMMONIUM CITRATE, EXPOSING THE SENSITIZED SURFACE TO A PATTERN OF ILLUMINATION, TREATING THE SURFACE, AFTER SAID EXPOSURE, WITH A SOLUTION OF POTASSIUM FERROCYANIDE, FOR BETWEEN ABOUT 10 AND 30 SECONDS, AND WITH SUFFICIENT AGITATION TO WASH AWAY SPURIOUS IMAGES, INTENSIFYING AND DEVELOPING A PRUSSIAN BLUE IMAGE CORRESPONDING TO THE PATTERN OF ILLUMINATION BY APPLYING A VERY WEAK AQUEOUS SOLUTION OF HYDROGEN PEROXIDE TO SAID SURFACE AND THEREAFTER SEALING THE INTENSIFIED IMAGE IN THE POROUS METAL SURFACE BY IMMERSING THE SURFACE BEARING THE INTENSIFIED IMAGE IN BOILING WATER FOR ABOUT 30 MINUTES.
References Cited (Backward Citations)
US1877246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |