US3138458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotography
Assignee: 3M Co
•
Filing: 1955-09-30
•
Granted: 1964-06-23
•
Expires: 1975-09-30
Abstract
No abstract record available.
Inventors
- 👤 Donald G Kimble
- 👤 Clarence O Mcmaster
- 👤 Byron W Neher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:59
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G13/00; G03G13/22; G03G13/26; G03G13/30; G03G5/043; G03G5/0433; G03G5/09; G03G5/10; G03G5/102; G03G5/12; G03G5/14; G03G5/147; G03G5/14704; G03G9/00; G03G9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF ELECTROPHOTOGRAPHIC PRINTING WHICH COMPRISES OPTICALLY PROJECTING THROUGHT THE ATMOSPHERE DIRECTLY ONTO THE FRONT OF A PHOTOCONDUCTIVE INSLULATING LAYER CARRIED ON AN ELEECTRICALLY CONDUCTING PAPER SUPPORT, A SHARP NEGATIVE OPTICAL IMAGE OF RADIATION TO WHICH THE LAYER IS SENSITIVE, SIMULTANEOUSLY CREATING AN ELECTRICAL CORONA DISCHARGE IN THE ATMOSPHERE IN FRONT OF THE LAYER AT AN ELECTRICAL POTENTIAL DIFFERENCE FROM SAID SUPPORT, DIRECTING A SUSPENSION OF DEVLOPER PARTICLES INTO THE PATH OF SAID IMAGE PROJECTING RADIATION AND INTO THE CORONA DISCHARGE WHICH IS OF SUFFCIENT INTENSITY TO CAUSE DEPOSITION OF THE PARTICLES ONTO THE PHOTOCONDUCTIVE LAYER IN A PATTERN CORRESPONDING TO THE OPTICAL IMAGE.
Claim 2
Independent Claim
105 words
THE METHOD OF ELECTROPHOTOGRAPHIC PRINTING WHICH COMPRISES OPTICALLY PROJECTING THROUGHT THE ATMOSPHERE DIRECTLY ONTO THE FRONT OF A PHOTOCONDUCTIVE INSLULATING LAYER CARRIED ON AN ELEECTRICALLY CONDUCTING PAPER SUPPORT, A SHARP NEGATIVE OPTICAL IMAGE OF RADIATION TO WHICH THE LAYER IS SENSITIVE, SIMULTANEOUSLY CREATING AN ELECTRICAL CORONA DISCHARGE IN THE ATMOSPHERE IN FRONT OF THE LAYER AT AN ELECTRICAL POTENTIAL DIFFERENCE FROM SAID SUPPORT, DIRECTING A SUSPENSION OF DEVLOPER PARTICLES INTO THE PATH OF SAID IMAGE PROJECTING RADIATION AND INTO THE CORONA DISCHARGE WHICH IS OF SUFFCIENT INTENSITY TO CAUSE DEPOSITION OF THE PARTICLES ONTO THE PHOTOCONDUCTIVE LAYER IN A PATTERN CORRESPONDING TO THE OPTICAL IMAGE.
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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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |