US3042616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing magnetic ink
Assignee: International Business Machines Corp
•
Filing: 1958-08-26
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Granted: 1962-07-03
•
Expires: 1978-08-26
Abstract
No abstract record available.
Inventors
- 👤 Robert J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS OF PREPARING MAGNETIC INK SUITABLE FOR USE IN HIGH SPEED MAGNETIC PRINTING WHICH COMPRISES THE STEPS OF WETTING A MAGNETIC CARRIER SUBSTANCE HAVING A PARTICLE SIZE OF ABOUT 10 MICRONS AND HAVING A HIGH PERMEABILITY WITH A SOLUTION OF A WATER INSOLUBLE RESIN MAINTAINED AT TEMPERATURES OF ABOUT 100*F. ADDING SAID WETTED SUBSTANCE WITH AGITATION TO AN AQUEOUS SOLUTION OF A VISCOUS ORGANIC MATERIAL SUPPORT MEDIUM TO FORM THEREBY SMALL SPHERICAL LIQUID DROPLETS DISCRETELY MAINTAINED IN SAID SUPPORT MEDIUM AND COMPRISING SOLID MAGNETIC CARRIER-RESIN MATERIAL SURROUNDED BY A SHEATH OF WATER IMMISCIBLE SOLVENT, COOLING SAID MIXTURE BY THE ADDITION OF WATER TO CAUSE GELLATION OF THE DROPLETS, WASHING AND AIR DRYING THE GEL PARTICLES TO CAUSE SAID PARTICLES TO SOLIDIFY THEREBY AS SPHERICAL MAGNETIC CARRIER-RESIN MAGNETIC INK PARTICLES.
Claim 2
Dependent Claim
115 words
A PROCESS OF PREPARING MAGNETIC INK SUITABLE FOR USE IN MAGNETIC PRINTING MACHINES WHICH COMPRISES THE STEPS OF WETTING A MAGNETIC CARRIER SUBSTANCE HAVING A PARTICLE SIZE IN THE ORDER OF MICRONS AND HAVING A HIGH PERMEABILITY WITH A SOLUTION OF A WATER INSOLUBLE RESIN CAPABLE OF BEING AFFIXED TO A RECORD MATERIAL, PROVIDING AN AQUEOUS SLURRY OF A FINELY DIVIDED WATER-INSOLUBLE INERT INORGANIC SOLID SUPPORT MEDIRM FOR SAID WETTED SUBSTANCE AGITATING THE MIXTURE TO FORM SPHERICAL LIQUID DROPLETS DISCRETELY MAINTAINED IN THE SUPPORT MEDIUM AND COMPRISING MAGNETIC CARRIER, RESIN AND A PARTIALLY WATER MISCIBLE SOLVENT AND THEN EXTRACTING THE SOLVENT THEREFROM TO CAUSE THEREUPON SOLIDIFICATION OF THE MAGNETIC CARRIERRESIN PARTICLES AS ESSENTIALLY SOLID SPHERES.
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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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |