US3595794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic developer
Assignee: Xerox Corp
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Filing: 1967-04-17
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Granted: 1971-07-27
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Expires: 1987-04-17
Abstract
Abstract AN ELECTROSTATOGRAPHIC DEVELOPER MIXTURE COMPRISING FINELY-DIVIDED ELECTROSCOPIC TONER PARTICLES HAVING A SIZE LESS THAN ABOUT 30 MICRONS AND SUBSTANTIALLY HOMOGENEOUS GLASS CARRIER PARTICLES HAVING AN AVERAGE PARTICLE SIZE BETWEEN ABOUT 30 MICRONS AND ABOUT 1000 MICRONS, EACH OF THE CARRIER PARTICLES HAVING A SPECIFIC GRAVITY BETWEEN ABOUT 3.0 AND ABOUT 7.6 AND CONSISTING ESSENTIALLY OF FROM ABOUT 12 PERCENT TO ABOUT 30 PERCENT BY WEIGHT OXIDES OF SILICON AND FROM ABOUT 70 PERCENT TO ABOUT 88 PERCENT BY WEIGHT OXIDES OF LEAD AND LESS THAN ABOUT 5 PERCENT BY WEIGHT OXIDES OF SODIUM, POTASSIUM, LITHIUM AND MIXTURES THEREOF.
Inventors
- 👤 Robert J Hagenbach
- 👤 Myron J Lenhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:28
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/182; C01F11/183; G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G9/00; G03G9/08; G03G9/10; G03G9/103
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |