US2857290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroferrographic printing process and apparatus therefor
Assignee: International Business Machines Corp
•
Filing: 1955-09-21
•
Granted: 1958-10-21
•
Expires: 1975-09-21
Abstract
No abstract record available.
Inventors
- 👤 Wallis D Bolton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
G; G03; G03G; G03G19/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD OF PRINTING AN ELECTROFERROSCOPIC POWDER DEVELOPED IMAGE FROM AN ELECTROFERROPLATE HAVING A PHOTOCONDUCTIVE INSULATING LAYER SUPPORTED BY A CONDUCTING MAGNETZABLE MEMBER ONTO THE SURFACE OF A PRINT RECEIVING MATERIAL, WHICH INCLUDES THE STEPS OF PRODUCING A COMPOSITE LATENT IMAGE ON SAID ELECTROFERROPLATE BY FORMING AND STORING A LATENT MAGNETIC IMAGE OF A FIRST OBJECT IN THE MAGNETIZABLE MEMBER OF SAID ELECTROFERROPLATE AND A LATEN ELECTROSTATIC IMAGE OF A SECOND OBJECT IN THE INSULATING LAYER THEREOF, DEVELOPING SAID COMPOSITE LATENT IMAGE BY APPLYING ELECTROFERROSCOPIC POWDER TO THE EXPOSED SURFACE OF THE INSULATING LAYER OF SAID ELECTROFERROPLATE, TRANSFERRING SAID ELECTROFERROSCOPIC POWDER DEVELOPED COMPOSITE LATENT IMAGE FROM SAID ELECTROFERROPLATE ONTO THE SURFACE OF THE PRINT RECEIVING MATERIAL, AND PERMANENTLY AFFIXING SAID TRANSFERRED ELECTROFERROSCOPIC POWDER IMAGE TO SAID PRINT RECEIVING MATERIAL.
Claim 2
Independent Claim
129 words
A METHOD OF PRINTING AN ELECTROFERROSCOPIC POWDER DEVELOPED IMAGE FROM AN ELECTROFERROPLATE HAVING A PHOTOCONDUCTIVE INSULATING LAYER SUPPORTED BY A CONDUCTING MAGNETZABLE MEMBER ONTO THE SURFACE OF A PRINT RECEIVING MATERIAL, WHICH INCLUDES THE STEPS OF PRODUCING A COMPOSITE LATENT IMAGE ON SAID ELECTROFERROPLATE BY FORMING AND STORING A LATENT MAGNETIC IMAGE OF A FIRST OBJECT IN THE MAGNETIZABLE MEMBER OF SAID ELECTROFERROPLATE AND A LATEN ELECTROSTATIC IMAGE OF A SECOND OBJECT IN THE INSULATING LAYER THEREOF, DEVELOPING SAID COMPOSITE LATENT IMAGE BY APPLYING ELECTROFERROSCOPIC POWDER TO THE EXPOSED SURFACE OF THE INSULATING LAYER OF SAID ELECTROFERROPLATE, TRANSFERRING SAID ELECTROFERROSCOPIC POWDER DEVELOPED COMPOSITE LATENT IMAGE FROM SAID ELECTROFERROPLATE ONTO THE SURFACE OF THE PRINT RECEIVING MATERIAL, AND PERMANENTLY AFFIXING SAID TRANSFERRED ELECTROFERROSCOPIC POWDER IMAGE TO SAID PRINT RECEIVING MATERIAL.
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |