Electrostatic liquid developing apparatus
Abstract
Abstract LIQUID DEVELOPING APPARATUS INCLUDES A RESERVOIR OF DEVELOPER FLUID CONNECTED BY MEANS OF A PUMP TO A FEED TUBE ADJACENT WHICH ELECTROSTATICALLY IMAGED COPY MATERIAL IS PASSED FOR DEVELOPMENT. DEVELOPER LIQUID PUMPED FROM THE RESERVOIR TO THE TUBE WHEREAT THE LIQUID IS EXPELLED FROM APERTURES FORMED IN THE TUBE WALL. A KNIFE EDGE ELECTRODE IS SPACED FROM THE FEED TUBE OPPOSITE THE APERTURES. THE FEED TUBE AND KNIFE EDGE ELECTRODE ARE CONNECTED TO A VOLTAGE SOURCE TO PROVIDE A BIASING EFFECT, CAUSING TONER PARTICLES TO BE ATTRACTED TOWARD THE KNIFE EDGE ELECTRODE AND TO ACCUMULATE WITHIN THE DEVELOPER LIQUID NEAR THE COPY MATERIAL THEREBY TO AID IN THE DEVELOPMENT THEREOF WITHOUT WETTING THE COPY MATERIAL EXCESSIVELY.
Inventors
- 👤 William R Maloney
- 👤 Richard J Pleitt
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |