Liquid developer electrophotography
Abstract
Abstract A liquid developer for electrophotography, which is prepared by dispersing, in a suitable carrier liquid, either independently or together with a surface active agent, a toner which is obtained by the so-called graft-copolymerization technique by a direct chemical bonding between a pigment and unsaturated compounds having a dispersing effect and a large electric charge polarity controlling ability, or more specifically, unsaturated compounds capable of chemically bonding to pigment, resulting in a large and distinct electric charge polarity of said toner in the carrier liquid and also capable of facilitating the dispersion of said particles in said carrier liquid which consists of a paraffinic hydrocarbon (including both isoparaffinic and paraffinic hydrocarbons) having a relatively high-electric resistance and a low-dielectric constant.
Inventors
- 👤 Zenjiro Okuno
- 👤 Hazime Machida
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |