US2924519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine and method for reproducing images with photoconductive ink
Assignee: International Business Machines Corp
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Filing: 1957-12-27
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Granted: 1960-02-09
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Expires: 1977-12-27
Abstract
No abstract record available.
Inventors
- 👤 Bruce I Bertelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/342; G03G13/00; G03G13/22; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
THE METHOD OF PRINTING COMPRISING THE STEPS: FORMING A LAYER OF A PHOTOCONDUCTIVE POWDER DIRECTLY UPON A METALLIC TRANSFER SURFACE AND MAINTAINING SUCH LAYER IN CONTACT WITH SUCH SURFACE BY MEANS OF ELECTROSTATIC ACTION, EXPOSING SELECTED PORTIONS OF SUCH LAYER TO THE INFLUENCE OF LIGHT IN THE FORM OF AN IMAGE AND THEREBY RENDERING CONDUCTIVE THE PORTIONS OF SAID POWDER WHICH HAVE BEEN EXPOSED TO LIGHT AND THEREBY BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN SUCH PORTIONS AND SAID SURFACE, REMOVING SAID EXPOSED PORTIONS OF SAID POWDER FROM SAID SURFACE, BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN THE REMAINING PORTIONS OF SUCH LAYER BY EXPOSING THE SAME TO THE INFLUENCE OF LIGHT, TRANSFERRING SAID REMAINING PORTIONS TO A COPY SHEET BY BRINGING SUCH SHEET INTO CONTACT WITH SAID EXPOSED REMAINING PORTIONS, AND FIXING SAID TRANSFERRED PORTIONS BY THE APPLICATION OF HEAT THERETO TO FORM A POSITIVE IMAGE UPON SAID COPY SHEET.
Claim 2
Independent Claim
147 words
THE METHOD OF PRINTING COMPRISING THE STEPS: FORMING A LAYER OF A PHOTOCONDUCTIVE POWDER DIRECTLY UPON A METALLIC TRANSFER SURFACE AND MAINTAINING SUCH LAYER IN CONTACT WITH SUCH SURFACE BY MEANS OF ELECTROSTATIC ACTION, EXPOSING SELECTED PORTIONS OF SUCH LAYER TO THE INFLUENCE OF LIGHT IN THE FORM OF AN IMAGE AND THEREBY RENDERING CONDUCTIVE THE PORTIONS OF SAID POWDER WHICH HAVE BEEN EXPOSED TO LIGHT AND THEREBY BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN SUCH PORTIONS AND SAID SURFACE, REMOVING SAID EXPOSED PORTIONS OF SAID POWDER FROM SAID SURFACE, BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN THE REMAINING PORTIONS OF SUCH LAYER BY EXPOSING THE SAME TO THE INFLUENCE OF LIGHT, TRANSFERRING SAID REMAINING PORTIONS TO A COPY SHEET BY BRINGING SUCH SHEET INTO CONTACT WITH SAID EXPOSED REMAINING PORTIONS, AND FIXING SAID TRANSFERRED PORTIONS BY THE APPLICATION OF HEAT THERETO TO FORM A POSITIVE IMAGE UPON SAID COPY SHEET.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |