US2846333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing electrostatic images
Assignee: Xerox Corp
•
Filing: 1955-11-01
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Granted: 1958-08-05
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Expires: 1975-11-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A PROCESS WHEREIN AN ELECTROSTATIC IMAGE IS DEVELOPED TO YIELD AN ELECTROSTATICALLY ADHEREING IMAGE OF ELECTROSTATICALLY ATTRACTABLE MATERIAL, THE IMPROVEMENT COMPRISING CONTACTING MAGNETIC FIELD PRODUCING MEANS WITH AN ELECGROSCOPIC DEVELOPER POWDER CONSISTING OF A FERROMAGNETIC FERRITE OF FROM ABOUT 100 TO 325 MESH AND HAVING THE COMPOSITION MEFE2O4, WHERE ME IS A BIVALENT METAL WHEREBY SAID POWDER IS FORMED INTO BRUSH-LIKE STREAMERS, THE PARTICLES OF SAID POWDER BEING DELECTROSTATICALLY CHARGED THROUGH TRIBOELECTRIC CONTACT WITH EACH OTHER, MOVING SAID FIELD PRODUCING MEANS RELATIVE TO A SURFACE BEARING AN ELECTROSTATIC IMAGE SO THAT SAID STREAMERS CONTACT SAID IMAGE, THE ELECTROSTATIC LINES OF FORCE FROM SAID IMAGE ATTRACTING OPPOSITELY ELECTROSTATICALLY CHARGED PARTICLES FROM SAID STREAMERS AND DEPOSITING SAID PARTICLES ON SAID SURFACE TO FORM ON SAID SURFACE A DEPOSIT OF SAID POWDER FAITHFULLY CORRESPONDING TO SAID IMAGE.
Claim 2
Dependent Claim
135 words
IN A PROCESS WHEREIN AN ELECTROSTATIC IMAGE IS DEVELOPED TO YIELD AN ELECTROSTATICALLY ADHEREING IMAGE OF ELECTROSTATICALLY ATTRACTABLE MATERIAL, THE IMPROVEMENT COMPRISING CONTACTING MAGNETIC FIELD PRODUCING MEANS WITH AN ELECGROSCOPIC DEVELOPER POWDER CONSISTING OF A FERROMAGNETIC FERRITE OF FROM ABOUT 100 TO 325 MESH AND HAVING THE COMPOSITION MEFE2O4, WHERE ME IS A BIVALENT METAL WHEREBY SAID POWDER IS FORMED INTO BRUSH-LIKE STREAMERS, THE PARTICLES OF SAID POWDER BEING DELECTROSTATICALLY CHARGED THROUGH TRIBOELECTRIC CONTACT WITH EACH OTHER, MOVING SAID FIELD PRODUCING MEANS RELATIVE TO A SURFACE BEARING AN ELECTROSTATIC IMAGE SO THAT SAID STREAMERS CONTACT SAID IMAGE, THE ELECTROSTATIC LINES OF FORCE FROM SAID IMAGE ATTRACTING OPPOSITELY ELECTROSTATICALLY CHARGED PARTICLES FROM SAID STREAMERS AND DEPOSITING SAID PARTICLES ON SAID SURFACE TO FORM ON SAID SURFACE A DEPOSIT OF SAID POWDER FAITHFULLY CORRESPONDING TO SAID 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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |