US2940934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic developer composition and method therefor
Assignee: Xerox Corp
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Filing: 1957-11-29
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Granted: 1960-06-14
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Chester F Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08724; G03G9/08704; G03G9/08706; G03G9/08713; G03G9/08715; G03G9/08717; G03G9/08722; G03G9/08726; G03G9/08728; G03G9/08742; G03G9/08766
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
AN IMPROVED XEROGRAPHIC DEVELOPER COMPRISING A MIXTURE OF FINELY-DIVIDED XEROGRAPHIC TONER PARTICLES ELECTROSTATICALLY COATED ON CARRIER PARTICLES, THE CARRIER PARTICLES BEING SHAPED TO ROLL ACROSS A SURFACE AND AT LEAST ABOUT 200 MESH AND HAVING REMOVABLY COATED THEREON BY ELECTROSTATIC ATTRACTION TONER POWDER PARTICLES HAVING A PARTICLE SIZE ON THE AVERAGE LESS THAN ABOUT 20 MICRONS, SAID TONE POWDER PARTICLES CONSISTING ESSENTIALLY OF FROM ABOUT 5 TO ABOUT 10 PERCENT PIGMENT AND 95 TO 90 PERCENT RESIN CONTAINING AT LEAST TWO-THIRDS BASED ON THE TOTAL WEIGHT OF THE TONER OF A POLYMERIZED BLEND OF MONOMERS OF STYRENE AND STYRENE HOMOLOGS OF THE FORMULA
References Cited (Backward Citations)
US2788288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |