US3346475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic method using an unsymmetrical ac current during development
Assignee: Research Laboratories of Australia Pty Ltd
•
Filing: 1964-02-20
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Granted: 1967-10-10
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Expires: 1984-02-20
Abstract
No abstract record available.
Inventors
- 👤 Matkan Josef
- 👤 Robert A Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:33
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G13/00; G03G13/06; G03G13/10; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF PRODUCING AN IMAGE WHICH COMPRISES DARK RESTING A PHOTOCONDUCTOR SURFACE, SUBJECTING THE DARK RESTED PHOTOCONDUCTOR SURFACE TO AN ELECTROMAGNETIC WAVE PATTERN WHEREBY AN IMAGE IS PRODUCED THEREON WHICH HAS A VARYING CONDUCTIVITY ACCORDING TO THE INTENSITY OF THE ELECTROMAGNETIC WAVE STRIKING ANY SPECIFIC AREA, AND WHILE IMMERSING THE PHOTOCONDUCTOR SURFACE IN AN ELECTRICALLY INSULATING LIQUID WHICH CARRIES ELECTRICALLY RESPONSIVE TONER PARTICLES, PASSING AN ALTERNATING ELECTRICAL CURRENT OF UNSYMMETRICAL WAVE FORM, WITH A BIAS TO MOVE TONER PARTICLES MORE DEFINITELY TOWARD THE PHOTOCONDUCTOR SURFACE THAN AWAY FROM THE SAID SURFACE, BETWEEN ELECTRODES DISPOSED ONE ON EITHER SIDE OF THE SAID SURFACE BUT SPACED FROM THE SURFACE ON THE IMAGE SIDE WHEREBY TO CAUSE TONER PARTICLES TO BE DEPOSITED ONTO THE SAID SURFACE IN PROPORTION TO THE STRENGTH OF THE DEPOSITING ELECTRICAL FIELD AT ANY SPECIFIC AREA.
Claim 2
Independent Claim
138 words
THE METHOD OF PRODUCING AN IMAGE WHICH COMPRISES DARK RESTING A PHOTOCONDUCTOR SURFACE, SUBJECTING THE DARK RESTED PHOTOCONDUCTOR SURFACE TO AN ELECTROMAGNETIC WAVE PATTERN WHEREBY AN IMAGE IS PRODUCED THEREON WHICH HAS A VARYING CONDUCTIVITY ACCORDING TO THE INTENSITY OF THE ELECTROMAGNETIC WAVE STRIKING ANY SPECIFIC AREA, AND WHILE IMMERSING THE PHOTOCONDUCTOR SURFACE IN AN ELECTRICALLY INSULATING LIQUID WHICH CARRIES ELECTRICALLY RESPONSIVE TONER PARTICLES, PASSING AN ALTERNATING ELECTRICAL CURRENT OF UNSYMMETRICAL WAVE FORM, WITH A BIAS TO MOVE TONER PARTICLES MORE DEFINITELY TOWARD THE PHOTOCONDUCTOR SURFACE THAN AWAY FROM THE SAID SURFACE, BETWEEN ELECTRODES DISPOSED ONE ON EITHER SIDE OF THE SAID SURFACE BUT SPACED FROM THE SURFACE ON THE IMAGE SIDE WHEREBY TO CAUSE TONER PARTICLES TO BE DEPOSITED ONTO THE SAID SURFACE IN PROPORTION TO THE STRENGTH OF THE DEPOSITING ELECTRICAL FIELD AT ANY SPECIFIC AREA.
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |